The utility model discloses a shallow layer loose sand horizontal well screen pipe prevent blockking up well washing device for the well completion. Include: outer tube, director, locking piece, inner tube, seal cover, compression spring, guide shoe and inserted bar. Wherein: the outer tube both ends are threaded, the sub -unit connection guide shoe, and the outer tube surface is the cloth hole all around, director upper portion area toper guiding mechanism, built -in sealing washer, the locking piece rebounds to restore to the throne to the inner tube device and realizes the locking function, the inner tube device is connected with the seal cover, and the inserted bar is equipped with the circulation hole, and when the inserted bar pushed down the inner tube device, the seal cover was down, exposes the circulation hole on the outer tube, carries out pickling construction, after the operation, provides the inserted bar, and compression spring realizes that inner tube device and seal cover to the function of closing in circulation hole, effectively prevent intraductal emergence of shaking out of later stage, device simple structure, the construction operation is convenient, and the reliability is high.