Building foundation soil layer drill rod detection device

The invention relates to the technical field of drill rod detection, in particular to a drill rod detection device for a soil layer of a building foundation. Comprising a base, a supporting frame, a drill rod, a connecting frame, a laser sensor, a plug pin, a depth adjusting mechanism, a covering mechanism and the like, the drill rod is arranged on the base, the upper end of the drill rod is fixed to the connecting frame through the plug pin, the laser sensor used for recording the hammering number is installed on the connecting frame, and the depth adjusting mechanism is used for controlling the drill rod depth of the drill rod. The covering mechanism is used for automatically covering the drill rod detection hole. The drill hammer is intermittently poked to move upwards through the poking block, the drill hammer can intermittently fall downwards to hit the drill rod into the ground, meanwhile, the movable plate can be moved to a proper height through the scales on the drill rod, the depth of the drill rod h