Electric locking rotation joint for auxiliary arm in surgery operation

The utility model discloses an electric locking rotation joint for an auxiliary arm in surgery operation, which is characterized by comprising a joint rotating mechanism and a joint locking mechanism; the joint rotating mechanism is disposed on the upper part of the joint locking mechanism and comprises a joint rotating shaft, a joint bearing cap, a joint bearing seat and a joint chassis; the joint locking mechanism comprises a locking outer sleeve, a friction ring, a trapezoidal nut, a leading screw shaft and a motor; the output shaft of the motor drives the leading screw shaft to move; the leading screw shaft drives the trapezoidal nut which is screwed with the same to move; the trapezoidal nut is circumferentially fixed by the locking outer sleeve outside so that it is limited to move in the vertical direction and drives the friction ring on the upper part of it to move in the vertical direction; the friction ring and the joint chassis are contacted to generate a friction and separated to remove the friction; and the joint rotating shaft is threaded with the joint chassis so as to lock or release the joint rotating shaft. The utility model has compact structure, convenient operation and maintenance, reliable locking and releasing and excellent performance.