The utility model provides a drying oven temperature monitoring system, solving the problem that at present each drying oven is provided with one temperature monitoring device so that monitoring the temperature of all the drying ovens requires observing a temperature display device on each drying oven successively and each temperature display device does not display the historical temperature. The drying oven temperature monitoring system is characterized in that the output ends of a plurality of identical signal pickup assemblies access an interface inside an industrial personal computer through connection in parallel; each signal pickup assembly is formed by two temperature sensors, an interface box and a proximity sensor; the two temperature sensors and the interface box are arranged in each drying oven; the proximity sensor is arranged at 3 to 5mm being apart from the outside of each drying oven; the output ends of the two temperature sensors are respectively connected with the input ends of two transmitters; the output ends of the two transmitters are connected with a 485 interface of a multi-serial-port card successively; and the output end of the proximity sensor is connected with an I/O interface. The drying oven temperature monitoring system has the advantages of assembling the temperature monitoring of all the drying ovens into one temperature monitoring system, and being able to monitor the time and the number for opening and closing the door of each drying oven.