Protective barrier capable of being quickly dismounted and building curtain wall

The utility model discloses a protective barrier capable of being quickly dismounted. The protective barrier comprises a barrier lower transverse frame assembly, a barrier handrail, a barrier vertical frame, a mounting component and a connecting piece. Wherein the handrail vertical frame is detachably connected to the handrail lower transverse frame assembly in an inserted mode, and the handrail handrail is fixedly arranged at the upper end of the handrail vertical frame; the installation components are fixedly arranged at the two ends of the handrail, and the connecting pieces are arranged on the installation components and used for being connected with a curtain wall vertical frame. The mounting component comprises a mounting piece, a spring and a guide piece; the guide part is slidably arranged on the mounting part, the first end of the spring is connected with the mounting part, and the second end is connected with the guide part; one end of the guide piece extends out of the installation piece and then i