The utility model relates to an improved type power line constituted by a signal acquisition wiring clamping port, a power supply connecting line, and a mobile power supply connecting port. The signal acquisition wiring clamping port and the mobile power supply connecting port are respectively disposed on two ends of the power line. Compared to the prior art, the improved type power line is advantageous in that the operation is simple and convenient, and the signal acquisition device can be conveniently connected with the mobile power supply; after the problems of the power supply of the device and the synchronization signal acquisition are solved, a lot of wire coils and other auxiliary devices are not required by the on-site detection, therefore the on-site devices can be greatly simplified, and at the same time, the costs of the original auxiliary tools can be saved.