| CPC G01B 5/0004 (2013.01) | 10 Claims |

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1. A fixing structure of a clamp-on type pipeline measuring device, comprising:
a clamp, detachably fixed on an outside surface of a pipeline along an axis of the outer surface of the pipeline; and
an aligning member, disposed in the clamp, wherein a plane tangent to the outer surface of the pipeline on the axis is defined as an installation datum plane; during detaching and fixing the clamp, the aligning member moves along a normal direction of the installation datum plane; after the clamp is fixed to the outer surface of the pipeline, the aligning member contacts at least two line segments on the outer surface of the pipeline, and distances between the two line segments and the installation datum plane are the same.
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