The utility model discloses a finalized protective barrier which comprises vertical supporting frames, an upper transverse braces, a lower transverse brace, connecting pieces, a base and a protection net. The lower ends of the vertical supporting frames are fixed to the base. The upper transverse brace and the lower transverse brace are fixed between the vertical supporting frames. Two or more connecting pieces are fixed to the side wall of the outer end of each vertical supporting frame. The protective net is fixed among the vertical supporting frames, the upper transverse brace and the lower transverse brace. The connecting pieces are provided with connecting structures connected with one another. A connecting structure connected with the foundation ground is arranged on the base. By means of the finalized protective barrier, finalization and instrumentalization are achieved, and the specifications are unified so that mass production can be facilitated; the finalized protective barrier is convenient and rapid to install and detach, the installation and detachment labor intensity is lowered, the input of manpower and material resources during construction is reduced, and the finalized protective barrier is simple in structure, wide in application range, high in safety coefficient and capable of better improving safety guarantees; the construction cost can be effectively reduced.