The invention relates to a wall flow prevention sprayer for a cooling tower. The upper half part of a fixing sleeve is fixedly connected with a water distribution branch pipeline; the lower half part of the fixing sleeve is positioned and fixedly connected with a water inlet in the upper end of a sprayer main body; a conical flow guide channel of the sprayer main body is provided with a back water baffle; the middle of the back water baffle is sequentially provided with four splashing plates from top to bottom; each splashing plate is provided with a splashing plate sawtooth-like edge; the spraying area of the sprayer is a semicircle; a circle of the wall flow prevention sprayers are arranged right above the padding edge of the cooling tower; the positions of the sprayers are fixed, so the spraying area fully falls onto padding; two types of sprayers are used in a matching mode, so the generation of wall flows can be effectively reduced, and the problem that no spraying water exists in a certain area of the padding due to the change of the sprayer flow can be avoided. The wall flow is avoided, no wall flows occur even the flow is changed, the occurrence possibility of the spraying water-free area is greatly reduced, the whole spraying is more uniform and the cooling capacity of the tower is obviously improved.