The invention discloses a temperature measuring device and a temperature measuring method of an electromagnetic oven cooker. The temperature measuring device comprises an electromagnetic oven, a cooker, a temperature sensor, a temperature detecting circuit, an electromagnetic oven control circuit and a direct current power supply for providing electricity for the temperature sensor and the temperature detecting circuit; the temperature sensor, the temperature detecting circuit and the direct current power supply are all arranged on the cooker; the temperature sensor is electrically connected with the temperature detecting circuit. The temperature measuring device also comprises a first radio receiving and transmitting device and a second radio receiving and transmitting device; the first radio receiving and transmitting device is arranged on the cooker and respectively electrically connected with the temperature detecting circuit and the direct current power supply while the second radio receiving and transmitting device is arranged in the electromagnetic oven and electrically connected with an electromagnetic oven control circuit. Because the radio receiving and transmitting devices are arranged on the cooker and the electromagnetic oven respectively, the cooker and the electromagnetic oven are accurately matched; therefore, the problem of confused information transmission of radio devices for the multiple cookers or ovens is solved, immediate and accurate property for temperature measurement is improved, and phenomena of oil smoke and food burning caused by overhigh temperature are prevented.