The invention relates to a machine tool circuit controller, in particular to a machine tool circuit controller based on a single chip microcomputer. The machine tool circuit controller comprises a power supply device and a control device, wherein the power supply device comprises a control device power supply module and a contactor power supply module which are used for supplying power to the control device and multiple machine tool circuit contactors respectively; the control device power supply module is connected with the control device through a power line; the contactor power supply module is connected with the multiple machine tool circuit contactors through a power line; the control device comprises a core component, namely, a single chip microcomputer; various machine tool circuit control programs are built in the single chip microcomputer and used for controlling power supplies of the multiple machine tool circuit contactors; and an output end of the control device is connected with the contactor power supply module through a control line. According to the machine tool circuit controller, the structure of a control circuit is simplified, the reliability of the control circuit is improved, power consumption and operation noise of the control circuit are reduced, the maintenance is simple, the cost is low, the trip phenomenon can be avoided, and normal operation of equipment is guaranteed.