Height-adjustable protective fence for municipal construction

The height-adjustable protective fence for municipal construction comprises a protective fence body, a connector is fixed to the left side of the protective fence body, and a top plate is arranged at the top end of the protective fence body. According to the height-adjustable protective fence for municipal construction, in the using process of the protective fence, a set of protective fence bodies can correspondingly stretch into the connecting frame through connectors on the left side, and then lock pins penetrate through the connecting frame and through holes from the top end of the connecting frame; two or more groups of guardrail main bodies can be combined, connected and lengthened by arranging the locking pins and the through holes, the two groups of guardrail main bodies can be hinged through the arranged locking pins and the through holes, the angle between the two groups of guardrail main bodies can be flexibly adjusted during use, and the two groups of guardrail main bodies can be firmly locked and