Objective To study the biomechanical characters of male weightlifter’s squat snatch technique. Methods 8 Channel EMG System, 3D force measure system and digital video were adopted to collect sEMG of 8 representative skeletal muscles, plantar force and synchronized video during male weightlifter’s squat snatch in different weights from Shanghai weightlifting team. Results The plantar force curves of weightlifter’s squat snatch in different weights are consistent. The squat snatch technique can be divided into 7 phases based on characteristic curve patterns of plantar force. During squat snatch, the active order of skeletal muscles is M. latissimus dorsi, M. erector spinaeta, M. rectus femoris, M. deltoideus, M. triceps brachii, M. tibialis anterior, M. biceps brachii and M. trapezius. The integrated EMG value of M. trapezius is largest while that of M. latissimus dorsi is smallest. With increasing of barbell weight, the integrated EMG values of M. triceps brachii and M. deltoideus increase to it maximum. Conclusion Attention shall be paid to training weightlifter’s M. trapezius, M. triceps brachii and M. deltoideus during squat snatch in order to improve the weight lifting performance.