The application provides a device for measuring inclination, a
system for measuring inclination and a method for judging validity of measurement data, the device for measuring inclination comprising a
repeater, a measuring head and a cable, the
repeater comprising an acquisition circuit and a rechargeable battery, the acquisition circuit comprising a single-
chip microcomputer, a power conversion circuit and a power supply
bus master station circuit, the acquisition circuit controlling the opening and closing of the power conversion circuit and the power supply
bus master station circuit through the single-
chip microcomputer, the measuring head comprising a power supply
bus slave
station circuit, one end of the cable being connected with the power supply bus
master station circuit and the other end of the cable being connected with the power supply bus slave
station circuit. Compared with the prior art, the technical scheme of the application can solve the technical problems of the prior art, i.e., large volume, large weight, high cost and poor portability of the cable of the device for measuring inclination.