Torque measuring device for arm driving motor of industrial robot

The invention discloses a torque measuring device for an arm driving motor of an industrial robot. The torque measuring device belongs to the field of motor torque measurement, and comprises a conductive collecting ring assembly and a signal acquisition assembly, wherein the conductive collecting ring assembly comprises a first conductive collecting ring and a second conductive collecting ring; the signal acquisition assembly comprises a voltage transmitting device, a first coil assembly, a second coil assembly and a voltage receiving device; the first coil assembly comprises a first transmitting coil and a first receiving coil; the second coil assembly comprises a second transmitting coil and a second receiving coil; the first transmitting coil and the first receiving coil are electrically connected with the outer wall of the first conductive collecting ring respectively; the second transmitting coil and the second receiving coil are electrically connected with the outer wall of the second conductive collect