The invention provides a magnetron detection device. The magnetron detection device comprises: a sealed shell; a detection platform that is installed in the sealed shell, wherein a microwave excitation cavity and a positioning part communicated with the microwave excitation cavity are arranged on the detection platform; a rapid fixing device that is arranged on the detection platform so as to fixthe magnetron at the positioning part; a microwave switching power supply that is electrically connected with the positioning part so as to supply power to the magnetron fixed at the positioning part;and a detection element that is arranged on the detection platform to detect the microwave output power of the magnetron. The magnetron detection device is small, exquisite, portable and easy to operate, and a user can conveniently judge whether the magnetron can work normally or not.