The utility model discloses a device for monitoring insufficient product material of a cold upsetting forming machine, and is characterized in that the device comprises a PLC (programmable logic controller); two input terminals of the PLC are connected with a material stop switch and a feeding sensor respectively; and one output terminal of the PLC is connected with a control circuit used for controlling action of an air cylinder and giving alarm when the machine stops, and the other output terminal is connected with a control circuit used for controlling the machine to continue production. The utility model can detect the problems of insufficient length and missing counting products during the production of equipment, and take corresponding measures to ensure normal operation of the equipment.