Automatic sampling device for radioactivity detection of building materials

The utility model provides an automatic sampling device for radioactivity detection of building materials, which relates to the technical field of building material detection and comprises a bottom plate, a radioactivity detector is mounted at the top end of the bottom plate, a conveying belt is mounted in the radioactivity detector in a penetrating manner, and a groove is formed in a top plate in a penetrating manner. An air cylinder is installed on one side of the top end of the top plate, a push plate is installed at one end of the air cylinder, limiting mechanisms are arranged at the front end and the rear end above the top plate, and a lifting mechanism is arranged below the top plate. The lifting mechanism is arranged below the top plate, building materials can be driven to move upwards through mutual cooperation of a mounting cavity, a servo motor, a threaded rod, a threaded sleeve, a hinge rod, a placing plate, a limiting rod and a limiting sleeve of the lifting mechanism, so that when the building ma