The invention discloses a prefabricated wall, a prefabricated wall and cast-in-situ component horizontal connecting node and a construction method. The prefabricated wall and cast-in-situ component horizontal connecting node comprises a prefabricated wall body, connecting steel bars and a cast-in-situ component. Embedded sleeves provided with internal threads are arranged on the side portion of the prefabricated wall body. The outer end portions of the multiple embedded sleeves are flush with the side surface of the prefabricated wall body and arranged in the height direction of the prefabricated wall body at intervals. One ends of the connecting steel bars are in threaded connection with the embedded sleeves, and the other ends of the connecting steel bars are located in the cast-in-situcomponent. The invention further discloses the construction method of the connecting node. According to the prefabricated wall, the prefabricated wall and cast-in-situ component horizontal connectingnode and the construction method, the factory prefabricated wallboard production difficulty and the mould perforating cost are lowered, the prefabricated wallboard transporting cost is lowered, wallboard hoisting can be performed after cast-in-situ component steel bar binding is performed during construction, the construction progress is accelerated, and the problem that prefabricated wallboard stretching-out steel bars in the prior art interfere with cast-in-situ component steel bars is solved.