The invention discloses a method and a system for torque control of electric driving system of electric automobile under a low tire-road friction condition. The system comprises a motor rotation speed signal acquisition and processing module and a master control module. The motor rotation speed signal acquisition and processing module acquires and processes rotation speed signals of a motor in the electric driving system and outputs motor rotation speed to the master control module. The master control module calculates a motor rotation speed change rate average value according to the motor rotation speed processed by the motor rotation speed signal acquisition and processing module, judges to determine a suitable control mode according to a calculation result of a calculation module and a motor torque instruction sent from an integral automobile controller, and calculates and sends a corresponding motor execution torque to a motor controller in the electric driving system. Whether the electric automobile has an operating condition of skidding on a road surface low in tire-road friction or not is judged according to the motor rotation speed change rate average value, and an upper threshold and a lower threshold are set, and accuracy in skidding judgment and skidding terminating can be realized by acquisition of appropriate judgment thresholds through integral automobile calibration.