Stiff composite pile

The utility model provides a stiff composite pile, and belongs to the technical field of composite piles. The stiff composite pile comprises an outer pile body and an inner pile body, the outer pile body and the inner pile body are connected in a sliding mode, a mounting block and a reinforcing mechanism are arranged at the bottom of the inner pile body, the reinforcing mechanism comprises two mounting plates, and the two mounting plates are both fixedly connected to one side of the mounting block 5; the number of the rotating shafts is two, and the two rotating shafts are fixedly connected between the two mounting plates; the circular ring is rotationally connected with the rotating shaft; the first fixing rod is fixedly connected to the outer wall of the circular ring, by arranging the reinforcing mechanism, when the pressure borne by the pile foundation is increased, the inner pile is stressed to slide downwards along the second sliding groove, the mounting block is driven to move downwards, and the mounti