The invention discloses a battery warm-up method for hybrid cars, and the method is that when the temperature of a car battery is lower, the battery can be recharged or discharged with small capacity to increase the internal temperature of the battery, so that the battery can work within the best using temperature range. The main steps are as follows: the temperature of storage batteries is checked and the car running state is determined; the SOC of the storage batteries is checked, if the SOC is lower than some set value, the rotating speed of an engine is increased in order to drive a hybrid motor to recharge the storage batteries; and if the SOC is higher than some set value, the storage batteries provide electricity for the hybrid motor to drive the engine until the electric energy is consumed to be lower than some set value, then the rotating speed of the engine is increased in order to drive the hybrid motor to recharge the storage batteries. The method makes use of the recharging or discharging work on the car storage batteries, so that the battery temperature is increased to the appropriate temperature without adding any hardware, and the method is simple and effective, and has high operability and practicability.