A balance control system of forging press based on active rectification principle was introduced, and the mathematical modeling for the moving beam, the driving cylinder and the driving system of the forging press system was accomplished by the analytical method and Laplace transform method, meanwhile the synchronous rectification accuracy was analyzed when the eccentric load acting on different location of moving beam. Furthermore, a simulation was carried out by MATLAB based on simplified control variables. The analysis results show that when the moving beam moves under the condition of the fastest pressing speed, the maximum eccentric load and the furtherest location of eccentric force, the active rectification time is the longest, namely the adjustment time is 2.00 s and the active synchronous rectification accuracy is 0.714 mm·m-1. Compared with the existing synchronous balance control system based on passive rectification principle, the adjustment time of active synchronous system is shorter and the rectification accuracy is higher.