The invention discloses a rich water sand layer region dewatering well construction method. Multiple water pressure pipes are welded on the outer side of a well pipe, the bottom end of the well pipe is blocked through a steel plate, and multiple filter holes communicating with the well pipe are formed in the side wall of the well pipe by gas cutting or drilling; the well pipe is vertically lifted up through a crane or a tower crane, the well pipe is put down to enable water outlet ends of the surrounding water pressure pipes to be away from the ground by 3-8 cm, the well pipe is manually righted, a water pump is started, water is sprayed out from the water pressure pipes to impact an area where a hole is to be formed, in the impact process of the water pressure pipes, the well pipe is slowly put down, and after the well pipe is put down by a certain distance, the well pipe is rotated to enable the aperture of a well hole to be uniform; and a gravel filter material is quickly fed in the well pipe. The construction method is free of drilling cost, fast in construction speed and obvious in economic benefit. The construction method is reliable in technology and fast in construction, causes no influence on underground water, and gains excellent social benefit. The construction method omits mud, has no influence on the underground water environment, is efficient and economical, and saves resources.