The invention discloses a battery pack temperature management system of a pure electric vehicle. The system comprises a bottom plate. A battery simulator is fixedly connected to the left side of the top of the bottom plate; a high and low temperature environment box is fixedly connected to the center of the top of the bottom plate; a BMS hardware-in-loop simulation platform is fixedly connected tothe right side of the top of the bottom plate; and an alarm is fixedly connected to the left side of the top of the BMS hardware-in-loop simulation platform. According to the invention, a data acquisition board card detects voltage, current and temperature and transmits the data to an SOC chip; processing is carried out by the SOC chip, if the temperature is higher than the set temperature, the SOC chip controls the alarm to emit red light; the SOC chip controls a condenser to work, and the condenser cools the battery body; and the SOC chip transmits the data to a battery simulator, and the battery simulator identifies parameters, thereby achieving the advantage of high detection precision, and solving a problem that a conventional pure electric vehicle battery pack is not high in detection precision during use.