Protective fence convenient to disassemble and assemble

The utility model discloses a guardrail convenient to disassemble and assemble, which comprises a support, a bolt and a pull rod, one side of the support is fixedly connected with a guardrail frame, the bottom of the support is fixedly connected with a base, and the bottom of the base is provided with a preassembled block; and the outer side of the plug pin is connected with the base in a penetrating mode, the bottom of the plug pin is connected with a preassembled block, and a clamping block is connected into the preassembled block. According to the protective fence convenient to disassemble and assemble, a positioning block at the bottom of a support is in butt joint with a pre-assembling block, when the positioning block makes contact with the inclined face of a clamping block, the clamping block can move to extrude a first spring so that the first spring can contract, and when a clamping groove in the positioning block makes contact with the clamping block, the first spring can reset to drive the clamping