The invention discloses a drilling and piling integrated machine. The drilling and piling integrated machine comprises a wheel house, a machine body bearing system, a power system, a hydraulic control system, an equipment supporting system, a drilling system and a piling system. The power system comprises a diesel engine, a clutch and an air compressor. The diesel engine is connected with the clutch through a gear transmission device. The clutch is connected with the air compressor through a conveying belt. The equipment supporting system comprises a gantry bracket, an upper connecting frame and a lower connecting frame. The drilling system comprises a hydraulic motor, a gearbox, a drilling cylinder, a coring drilling bit and a clamp hole drilling bit. The piling system comprises a breaking hammer, a chrome plated rod and a guardrail rod. According to the drilling and piling integrated machine provided by the invention, the diesel engine and the air compressor are connected through the automobile clutch principle, reliable separation of power and the air compressor in the running process of the drilling and piling integrated machine is ensured, and the service life of the air compressor is prolonged; the coring drilling bit and the clamp hole drilling bit are used in a matched mode for the first time in domestic, and the drilling quality and the drilling speed are high.