The invention discloses an automatic chip discharge type cutting saw for system door and window blanking. The cutting saw comprises a base, a workbench is integrally connected to the base and is of a disc shape, carrying frames are fixedly connected to the two sides of the workbench, a chip accumulating strip is arranged in the middle of the workbench, a micro motor is fixedly installed on the end face of the chip accumulating strip, a chip discharge shaft is fixedly connected to the shaft end of the micro motor, and chip discharge teeth are arranged on the chip discharge shaft; a limiting plate is fixedly connected to the upper surface of the workbench, a dust collector is fixedly connected to the position behind the workbench, a support base is fixedly connected to the dust collector, and a fixing rack connected through a pin shaft is arranged above the support base. According to the cutting saw, the time that operating personnel remove iron chips generated in the equipment machining process can be effectively shortened, the working efficiency is improved, the safety problem generated by iron chip accumulation can be prevented, and the occurrence probability of safety accidents can be decreased.