The invention discloses a roadbed detection sampler which comprises a drill, wherein a bump is arranged on the outer side of the drill; a rotary shaft is arranged on the top of the drill; a thread isarranged on the outer surface of the rotary shaft; a bearing is arranged in the bottom of the rotary shaft; a motor is arranged on the top of the bearing; a motor room is arranged on the outer side ofthe motor; slide blocks are arranged on two sides of the motor room; a baffle plate is arranged in the bottom of the drill; fixed blocks are arranged on two sides of the baffle plate; brackets are arranged on the outer sides of the fixed blocks; two buffer seats are arranged in the bottom of an inner cavity of each bracket; a buffer rod is arranged between the two buffer seats; a buffer spring isarranged on the outer side of the buffer rod; and a chute is formed in the top of the inner wall of each bracket. By arranging a shock absorbing device and the easily mounted drill, the service lifeof the machine is prolonged.