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Based on the analysis of the whole system of magnesium alloy melting furnace, the functional requirements of the temperature control system are clarified. Based on the analysis of the melting process of magnesium alloy, the thermal stress situation in the heating furnace temperature rise period is analyzed by means of analysis of heat transfer simulation, the reasonable heating rate and magnesium melt temperature variation are determined. The method of control strategy based on PLC algorithm and multipoint temperature measuring are put forward to solve the temperature control system of magnesium melt temperature fluctuation in improper rate control and continuous casting. A set of control system based on PC and PLC is designed according to the functional requirements of magnesium alloy furnace temperature control system. The system uses PLC as the main control unit to realize the automatic heating control and data acquisition. At the same time, PC is taken as a human-computer interaction platform, and VB6.0 is used to develop computer monitoring software to realize on-line control of upper computer and lower computer and centralized control of the whole control system, which simplifies the operation, reduces the failure rate of the equipment, improve the work efficiency and the accuracy and flexibility of the system. The hardware configuration and software design of temperature control system for magnesium alloy melting furnace is completed, the temperature control system performance is tested, and the feasibility of heating system and the rationality that based on the duty ratio of hybrid control of output control and PID control are verified. According to the experimental results, the experimental system of magnesium alloy melting furnace is established, and the temperature control experiment is carried out. The experimental results show that the temperature control system achieves the expected control objectives.