Blocking system for water seepage crack of basement wall body and construction method thereof

The invention discloses a blocking system for a water seepage crack of a basement wall body and a construction method thereof. The blocking system comprises the wall body with the water seepage crack. A groove is formed in the back water surface of the wall body and in the corresponding position of the water seepage crack. Water guiding pipes for guiding the water seepage in the wall body are horizontally arranged in the groove. One ends of the water guiding pipes abut against the internal water seepage crack and fixed to the wall body through a first layer of crack blocking layer buried at the bottom of the groove. A valve is arranged on the part, outside the first layer of crack blocking layer, of pipe bodies, wherein the valve is in an opening state at the time of water guiding and in a closed state after water guiding. A second layer of crack blocking layer is arranged in the interior, outside the first layer of the crack blocking layer, of the groove. The second layer crack blocking layer buries the water guiding pipes after completion of water guiding and the valve inside the groove, and the groove is filled and leveled up. A waterproof layer is laid outside the second layer crack blocking layer. The blocking system has the characteristics of safety, applicability and the like and has good popularization and practical value, and good economic benefit is produced after wide application and popularization.