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1. An electric connecting device, comprising an insulator which is provided with a front end abutting surface and a rear end mounting surface, a terminal module housed in the insulator, and a USB plugging module installed in the insulator, wherein a first plugging cavity and a second plugging cavity distributed in a horizontal direction and a guide hole between the first plugging cavity and the second plugging cavity are arranged in the insulator; the first plugging cavity forwardly penetrates through the front end abutting surface and forms a round interface on the front abutting surface; the second plugging cavity forwards penetrates through the front end abutting surface and forms a USB interface on the front end abutting surface; and the round interface, the guide hole and the USB interface are linearly arranged from left to right, and wherein the insulator is further provided with a protrusion portion protruding backwards beyond the rear end mounting surface; the protrusion portion is provided with an inverted U-shaped slot, and an inner slot and a central slot located inside the inverted U-shaped slot; and the inverted U-shaped slot, the inner slot and the central slot all penetrate through the first plugging cavity from the back to the front so as to accommodate the terminal module.
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