The invention discloses a prefabricated part and a semi-prefabricated construction method for a multistory building. The prefabricated part comprises a prefabricated outer wall (6), the prefabricated outer wall (6) comprises a reinforced concrete wall body (61); the middles of the end surfaces of two side edges of the reinforced concrete wall body (61) are provided with a groove (611) respectively; a plurality of exposure steel bars (63) are extended out of the end surfaces of two sides of the reinforced concrete wall body (61); and the plurality of exposure steel bars (63) are fixedly connected with a steel mesh in a cast-in-place bearing horizontal wall (11) which is adjacent to and in the same layer with the exposure steel bars. The semi-prefabricated construction method comprises the following steps of: constructing the prefabricated outer wall and prefabricated floor plates; laying the prefabricated floor plates and pouring concrete on the prefabricated floor plates to form semi-prefabricated floor plates; temporarily fixing the prefabricated outer wall by using a flexible straight bar and a triangular bracket; and pouring the bearing horizontal wall. By the prefabricated part and the semi-prefabricated construction method, the construction efficiency of the multistory building can be obviously improved, the construction cycle is shortened, and the construction cost is reduced.
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