The invention relates to an analytical method for power circulation of an electric drive vehicle speed change mechanism. The method comprises the steps that parameters of the speed change mechanism are defined; a coefficient matrix of a rotational speed analysis equation of the speed change mechanism is constructed; rotational speed vectors of all stressed ends, except operation parts, relative to the input end are acquired; a structural description matrix of the speed change mechanism and the rotational speed vectors are utilized for generating a rotational speed matrix; a coefficient matrix of a torque analysis equation of the speed change mechanism is constructed; the torque analysis equation of the speed change mechanism is subjected to torque analysis, and torque vectors of all the stressed ends relative to the input end are acquired; a torque matrix is generated; the rotational speed matrix and the torque matrix are utilized for generating a power matrix; a power flow graph of the speed change mechanism is drawn. Through the analytical method, rotational speed analysis, torque analysis and power flow analysis of any speed change mechanism can be carried out in a programmed mode, and design efficiency is effectively improved.