The DC motor servo driving system based on network includes control module, drive module and network interface module connected into one integral via two 40-pin connectors. The servo driving system constitutes via RS485 and CAN bus interfaces one network control system with single or several servo driving units connected to PC and other control equipment to realize drive and control of multi-axis mechanism in serial network control mode. DSP obtains motion commands and motion parameters from the network interfaces, performs motion servo calculation of the sample data of the motor code wheelsignal or motor armature current by means of software control program to produce PWM output signal and complete the output control of the motor driving loop and the serial coordinational control of multi-axis drive via PWM signal. The present invention is suitable for robot, numerically controlled machine tool and production line.