The invention relates to an electric motor coach power control method: (1) when the coach is in a starting state, a generator set and a battery pack provide low current to make up the dropout voltage of a super capacitor according to the allocation principle; the super capacitor outputs high current to a driving system for driving a motor; (2) when a control system has an electric braking signal, braking energy starts to feedback, at the beginning, the super capacitor is used for bearing high load current to feed back and store the braking energy, and the generator set has no output power; when the feedback peak current is dropped out, the braking feedback energy charges the battery pack to carry out energy interaction mutually. In the electric motor coach power control method, the electric quantity of the purely electric motor coach can be utilized rationally, so as to drive longer distance with limit electric quantity.