An assembled structure system includes a prefabricated member, a fastener and a locking member. The prefabricated member is provided with at least one cavity, and the fastener is assembled in the at least one cavity. At least one fastener is assembled in each cavity. The cavity includes an upper end surface, a lower end surface, a left end surface and a right end surface. The left end surface or the right end surface includes a vertical surface perpendicularly connected to the upper end surface and an inclined surface connected to the vertical surface. A connection angle between the vertical surface and the outer side of the inclined surface forms an obtuse angle. The inclined surface is connected to the lower end surface. The fastener includes a fixed surface, two side surfaces and a bottom surface. The fixed surface, the two side surfaces and the bottom surface are hingedly connected. The fixed surface is provided with at least one locking hole. The bottom surface is a curved surface, an arc surface, or a trapezoidal surface, or the bottom surface is formed by two inclined bottom surfaces that are folded inwardly. The total width of the bottom surface is greater than or equal to the width of the lower end surface. The height of the fastener is higher than the height of the inclined surface. The assembly of the present invention is easy, convenient, fast and firm, has high accuracy and improves the anti-seismic performance.
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