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The multi-module cascade is a method used for insulation test which need a pulse power supply of high-performance,Symmetrical,and bipolar. In order to cascade,it needs a high isolation DC power which can coordinated control. Designing the BEC (Board-level Embedded Controller) that which have embed to each power. As slave nodes,each BEC should utilize the RS485 connection and Modbus protocol with EHC (Embedded host controller) to constitute a master-slave fieldbus network,and working under the control of master node. Utilizing the BEC’s STM32F103C8 processor to generate a complementary PWM controller signs which can isolate DC-DC bridge,and check the electric current,output voltage under isolation. Through the variable parameters incremental digital PI algorithm which based on the current switch to determine the value of pulse width to generate the closed loop PWM control signal of Buck regulating circuit ,realizing voltage regulation and stabilization of output voltage. Experimental results show that the embedded controller can satisfy the cascading symmetrical bipolar rectangular wave pulse power supply for high isolation adjustable DC power supply needs.