The utility model discloses a control system for a mandrel pipe mill. The control system is characterized by comprising a first PLC (programmable logical controller), a second PLC, a roll gap control unit, a second-level managing unit and a data collecting unit, wherein the first PLC is configured to logically control a mandrel lubricating area, a cooling area, a mandrel and a tubular billet feeding and blanking area of the mandrel pipe mill; the second PLC is configured to control a stopping motor and a driving motor; the roll gap control unit comprises a third PLC; the third PLC comprises at least one application module; each application module is provided with a 64-bit RISC floating operation processor and a 0.1ms minimum cycle period; the second-level managing unit is used for managing and controlling a parameter of the control system; the data collecting unit is connected with the roll gap control unit through an optical fiber and is used for collecting the data in the roll gap control unit; the first PLC, the second PLC, the roll gap control unit and the second-level managing unit are connected through the Ethernet network. The control system for the mandrel pipe mill has the advantages of simple technique and low cost.