The invention relates to a motor counter electromotive force sampling system and method. The system comprises a motor counter electromotive force sampling unit that is connected with a motor counter electromotive force sampling control unit; the motor counter electromotive force sampling control unit acquires working state data of a wire feed motor; the motor counter electromotive force sampling unit is controlled to stop sampling motor counter electromotive force upon power supply continuation and wire feed loop inductive load recovery; motor counter electromotive force is sampled to maximumextent upon motor counter electromotive force occurrence, sampling is not subject to wire feed loop impedance and loop inductance, and counter electromotive force sampling accuracy is improved accordingly. A hardware circuit is directly used herein to control motor counter electromotive force sampling; the sampling method is simple and effective, the circuit is simplified, and the cost is lowered;counter electromotive force sampling precision is guaranteed to maximum extent, and control precision is improved for a wire feed motor.