The invention relates to a control system of an auxiliary robot of an orthopedic surgery, which belongs to the technical field of electromechanics and comprises an embedded central control module, a multi-axis movable control module, a plurality of alternating current servo drivers, a plurality of alternating current servo motors, a human-machine interactive module, a sensor module, a switch module, an indicator light module and an operating rod, wherein the embedded central control module comprises a system interface submodule, a state monitoring submodule, a network communicating submodule and a movable regulating submodule. The control system has high degree of freedom and strong applicability, can realize 7 degrees of freedom, has redundancy freedom, and is convenient for cooperative work of physicians. The control system has higher autonomy and open structure, can be used as a basic platform to be combined with various navigation systems, and has flexible operating modes, convenient manipulation and high positioning precision.