PurposeIn order to realize accurate control of the heat sealing temperature of food packaging machine and improve the quality of food packaging, this study designed a heat sealing temperature control method of food packaging machine based on PLC technology.Select gathering food packages installed heat sealing temperature DS18B20 temperature sensor information, information will be collected after conversion to a serial digital signals sent to the PLC controller, PLC controller calculated temperature information and has the difference between the set temperature information, using PLC controller of closed-loop control module, through the RBF-PID heat sealing temperature control algorithm to realize the automatic temperature control, and the control result is sent to the human-computer interaction interface to realize accurate control of food packages installed heat sealing temperature. The method can control the heat sealing temperature error of the food packaging machine within 0.5 ℃, and the temperature can be quickly recovered when disturbance is added. The control method based on PLC technology can realize accurate control of the heat sealing temperature of food packaging machine, and effectively improve the heat sealing quality of food packaging.