The present utility model relates to an auxiliary heating device of an electric automobile charging pile. an electric connector for connecting with a heater of the charging pile, an electric connector for connecting with a temperature sensor of the charging pile, an electric connector for connecting with an external power supply, and an electric connector for connecting with an auxiliary power supply of the charging pile, the above connectors are connected with corresponding ports of the MCU, the MCU is also used for controlling and connecting a normally open switch for realizing on-off of the external power supply and the heater and a normally closed switch for realizing on-off of the external power supply and a charging pile auxiliary power supply through a drive circuit; and the auxiliary heating device also comprises a battery for supplying power for the MCU and the drive circuit. By adopting the device, heating efficiency is greatly enhanced, and heat losses are reduced.