The invention provides a method of pouring and constructing the side wall of a hydraulic building, comprising the following steps: a, wet concrete is prepared, and the wet concrete is evenly stirred into water, sand and gravel according to the mixing ratio of 0.55:1:2.64:4.86 for later use; b, dry concrete is prepared without using water, and the dry concrete is evenly stirred into sand and gravel according to the mixing ratio of 1:2.64:4.86 for later use; c, if the surface of the side wall of the hydraulic building has water and bubbles during the pouring of the wet concrete, the already stirred dry concrete whose volume accounts for 10 percent of the volume of the whole pouring concrete is evenly scattered on the vibrated surface of the side wall, then the vibrated surface is continuously vibrated until the surface of the concrete poured on the vibrated surface has no water, and the wet concrete is vibrated in a vibrating bin, wherein if the surface of the side wall is subjected to water again, the procedures are repeated until the side wall of the hydraulic building is poured well. The method of pouring and constructing the side wall of the hydraulic building is easy with low difficulty and can make the outer appearance of the side wall of the hydraulic building smooth.