The invention provides a working condition control method for a range extender. The working condition control method includes the following steps: step a, a real-time working condition of the range extender is revised to one type of stable working conditions of the range extender to obtain a real-time stable working condition; step b, the overall power demand of the range extender corresponds to one type of the stable working conditions of the range extender to obtain a target stable working condition; step c, the real-time stable working condition and the target stable working condition are compared, if the real-time stable working condition and the target stable working condition are the same, the whole control flow is ended, and otherwise, a step d is entered; and the step d, the real-time stable working condition is controlled to be converted to the target stable working condition, and then the whole control flow is ended. By means of the working condition control method for the range extender, switching of the range extender between different stable working conditions is realized, and normal running of an extended-range electric car is guaranteed.