The invention belongs to the technical field of building engineering, and particularly relates to a pipe rack side wall waterproof construction method. The pipe rack side wall waterproof construction method comprises the steps of firstly, base face acceptance check, secondly, base face treatment, thirdly, treatment of a 20 mm cement waterproof mortar layer with the proportion of 1:2; fourthly, treatment of an asphalt felt isolation layer; fifthly, treatment of a 2 mm three-dimensional polyurethane waterproof coating; sixthly, treatment of a 20mm cement waterproof mortar layer with the proportion of 1:2. According to the pipe rack side wall waterproof construction method, through introduction of multiple layers of different types of waterproof materials for laying and multiple layers of wireless humidity sensors, the construction quality is monitored, the construction period can be effectively shortened, the construction quality is improved, and the maintaining unit can be informed of the waterproof problem appearing in the building use process in time.