A complex servo control system includes a host control end, a servo master controller, and a plurality of servo streams. The host control end sends control commands, and the servo master controller receives the control commands to generate corresponding control signals. Each control signal includes an identification code and a setting value. The servo streams are electrically connected to the servo master controller in parallel. Each of the servo streams includes a plurality of servos and each of the servos has a given an identification code. The servo master controller sends the control signals to one of the servo streams according to the identification code carried by the control signals, and the control signals are then received and sent downwards in sequence by the servos of the servo stream. When the identification code carried by control signals match the given identification code of one of the servo, the servo having the identification code activates according the setting value.