When the traditional PID(Proportion-Integral-Derivative) algorithm is applied to the high frequency electromagnetic induction boiler, it will become a very complex high-order function. It is difficult for the system to maintain the optimal setting, and it needs to adjust the parameters manually. To solve this problem, we design the system into several blocks according to the control objects such as temperature, pressure and flow, each block contains a power pulse width drive device. Each block operates in a closed loop according to the Boolean function established for it and the target parameters set for it, and does not introduce parameters requiring manual auxiliary adjustment. The practical application in high frequency induction boiler shows that the algorithm has good control effect in this complex control system.