The invention relates to an erection device, comprising a circular sleeve and identical right triangle reinforcement plates, the same right-angle sides of the reinforcement plates are uniformly weldedon the outer wall of the sleeve at intervals along the sleeve shaft, a riser pipe penetrates through and is welded on the sleeve, the non-welding right-angle sides of the reinforcement plates are aligned with the end plane of the sleeve. The erection device has simple structure and good guidance quality, thorough solving the problem that the riser pipe under the mud line is easy to incline and bend in the offshore piling process.