The invention relates to a mechanism for accurately controlling the heat-seal temperature of a heating wire. The mechanism for accurately controlling the heat-seal temperature of the heating wire comprises a first power generation component, a second power generation component, a PLC, a PID module and a PWM controller, wherein the second variable voltage is the PWM direct current voltage; the output end of a second solid-state relay is connected with a Hall current sensor in series and connected with the heating wire; the PID module and the PWM controller are contained in the PLC, the temperature change of the heating wire is worked out by using the PID module of the PLC according to the resistance value of the heating wire fed back by the hall current sensor, and accordingly the on-off time of the second solid-state relay is prolonged or shortened. According to the method and mechanism for accurately controlling the heat-seal temperature of the heating wire, two groups of voltages aresuperposed, the temperature change of the heating wire is accurately detected by the Hall current sensor, the heat-seal time of a film body by the heating wire is further adjusted, the temperature inthe heat-seal process is accurately monitored, and the heat-seal effect is improved, so that the method has the beneficial effect of remarkably improving the product quality.