Sampling device for roadbed detection

The utility model discloses a sampling device for roadbed detection, which comprises a bottom plate, support legs, an extension plate, support outer frames and a control panel, the support outer frames are mounted on two sides of the top end of the bottom plate, a second motor is arranged at the top end of one side of each support outer frame, and a second rotating shaft is mounted at the output end of each second motor through a coupler. A driving wheel is arranged at the bottom end of the second rotating shaft, a driven wheel is installed at the top end of the side, away from the second motor, of the supporting outer frame, the driving wheel and the driven wheel are connected through a belt, an extension plate is installed in the center of the top end of the bottom plate, and a first motor is arranged at the top end of the extension plate; a first rotating shaft is mounted at the output end of the first motor through a coupler, and a first gear is mounted at the bottom end of the first rotating shaft. Accor