The detection device disclosed by the utility model comprises a box body and a controller arranged in the box body, the relay network is connected with the controller and used for adjusting the working state of relays forming the relay network according to the received control instruction sent by the controller; the first interface is in network connection with the relay, arranged on the box bodyand used for connecting a load; one end of the load is connected with a first relay in the relay network through a first interface, and the other end of the load is connected with a second relay in the relay network through a first interface. And one end of the resistance measurement module is connected with the relay network, and the other end is connected with the controller. Due to the fact that whether the temperature sensor meets the continuity requirement or not is automatically checked, the resistance does not need to be measured manually, whether the continuity requirement is met or not does not need to be judged manually, the influence of human factors on the checking result is avoided, and the accuracy of the checking result is improved.