The invention provides a method for optimizing charge and discharge power of an electric car charge-storage-discharge integrated power station. The method is characterized in that the interaction power between an integrated power station and a power grid is optimized through a particle algorithm, so that the difference between peak and valley for the power grid load can be greatly reduced; and the capability that the integrated power station participates in the power grid auxiliary service has positive correlation with the capacity of a power station energy storage system, that is, the greater the capacity becomes, the greater the capability that the integrated power station participates in the power grid auxiliary service becomes, and the more significant the effect of peak clipping and valley filling becomes. The method for optimizing charge and discharge power of an electric car charge-storage-discharge integrated power station can also further reduce the cell loss cost for the charge-storage-discharge integrated power station.