The invention discloses an arrangement method for drainage inspection wells applied to a comprehensive pipe rack. The lower portion of the comprehensive pipe rack is provided with a rain and sewage channel. The arrangement method is characterized by comprising the following steps that the drainage inspection wells leading to the ground are arranged along the comprehensive pipe rack at equal intervals and are arranged on one side of the comprehensive pipe rack; the lower portion of each drainage inspection well is provided with a flow passing part which stretches into the lower portion of the comprehensive pipe rack; the flow passing parts of the drainage inspection wells and the upstream and downstream rain and sewage channel are located on the same straight line; inlet and outlet openings of the inspection wells are horizontally moved to one side of the pipe rack; and the inlet and outlet openings of the inspection wells upwards lead to the ground. The arrangement method has the following beneficial effects that the arrangement of pipelines above cannot be affected by the inspection wells, and the arrangement of pipelines above is simple and smooth; the arrangement of the pipelines above cannot be affected by the inspection wells, and the pipelines above the same side can be gravity pipe channels; and the flow passing parts of the inspection wells are smoothly jointed with the upstream and downstream rain and sewage pipe (channel), so that blockage is not likely to happen.