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1. A back-contact solar cell module, comprising a number of cells arranged in series, wherein the cells are non-solder pad ultrafine main busbar back-contact solar cells, wherein each of the non-solder pad ultrafine main busbar back-contact solar cells comprising a first finger and a second finger arranged alternately along a Y-axis direction on a back side and both extended and provided in an X-axis direction to collect currents of two different polarities of a cell, a first main busbar line perpendicular to the first finger, a second main busbar line perpendicular to the second finger, a first insulation layer, in a Z-axis direction, provided between and respectively being in contact with the first main busbar line and the second finger, and a second insulation layer provided between and respectively being in contact with the second main busbar line and the first finger, wherein the first main busbar line is connected to at least two first fingers and at least one of connected first fingers is closest to an X-axis edge on the back side, and the second main busbar line is connected to at least two second fingers and at least one of connected second fingers is closest to the X-axis edge on the back side; no pad is provided on the first main busbar line and the second main busbar line, and widths in the X-axis direction of the first main busbar line and the second main busbar line are each independently 10-100 μm; and first main busbar lines or second main busbar lines are provided in an extending manner or at intervals along the same axis perpendicular to corresponding fingers connected thereto, respectively, and when spaced apart, a distance L between two adjacent corresponding main busbar lines in the Y-axis direction is 5-100 mm, wherein the first main busbar line and the second main busbar line are provided in pairs and their pairs are provided at least in regions on both sides of the back side of the cell in the X-axis direction and/or in the Y-axis direction, and the back-contact solar cell module further comprises a number of welding strips and curing adhesive, wherein the welding strips are provided over the Z-axis direction of each insulation layer and corresponding main busbar lines thereon and extend in the Y-axis direction, and the welding strips connect the number of cells in series; and the curing adhesive is provided above the Z-axis direction in welding strip regions corresponding to the corresponding main busbar lines, and a length in the Y-axis direction of the curing adhesive is smaller than a length in the Y-axis direction of the corresponding main busbar lines below the curing adhesive.
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