House building foundation pit protection device

The utility model relates to the technical field of foundation pit protection, in particular to a house building foundation pit protection device which comprises a guardrail plate, a pointed cone is fixedly arranged at the lower end of the guardrail plate, a hinge hole is formed in one side of the guardrail plate, a groove is formed in the guardrail plate on the side, a fixing plate is fixedly arranged at the upper end of the other side of the guardrail plate, and the fixing plate is fixedly connected with the pointed cone. A matching hole is formed in the fixing plate, a protruding block is fixedly arranged at the upper end of the side, provided with the fixing plate, of the guardrail plate, a connecting column is welded to the lower end of the protruding block, a pointed cone is fixedly arranged at the lower end of the guardrail plate, the guardrail plate is fixed to the ground through the pointed cone, and meanwhile the connecting column is fixedly arranged on one side of the guardrail plate. The connectin