The invention relates to a method for leading pre-embedded pipes in concrete out of side wall joints, comprising the following steps: A, positioning a pipe pre-embedded in concrete; B, binding reinforcing steel bars of side walls according to the design requirements, and erecting a template of a side wall; C, connecting one end of a casing with the pre-embedded pipe, sealing the other end of the casing for protection, and clinging the other end of the casing to the template of the side wall; D, pouring concrete; and E, detaching the template of the side wall after the strength of the concrete reaches the mould stripping requirement, cleaning up the opening of the casing, connecting the casing with a pipe of same diameter, and leading out the casing. Due to the steps, the construction of leading the pre-embedded pipe in the concrete out of side wall joints is realized. Because the pre-embedded pipe in the concrete is connected with the casing through screw threads, the external sealing and internal unblocking of the pre-embedded pipe are ensured. After finishing pouring the concrete and stripping the mould, the pre-embedded casing is connected with the pipe of same diameter, and the pre-embedded casing is led out of the side wall joints without disposing holes on the template of the side wall, thus the template is kept complete, the cost is reduced, and the construction efficiency is improved.