Safety warning fence for building construction

The utility model discloses a building construction safety warning fence, and relates to the technical field of construction safety, the building construction safety warning fence comprises a fence net and two mounting rods, the fence net is arranged between the two mounting rods, L-shaped columns are fixed on the lower portions of the two opposite sides of the mounting rods, sliding grooves are formed in the upper portions of the two opposite sides of the mounting rods, sliding blocks are arranged in the sliding grooves in a sliding mode, and the L-shaped columns are connected with the sliding blocks in a sliding mode. The upper portion of each sliding block is fixedly provided with a fixing column, the lower end of each fixing column is fixedly sleeved with a first conical sleeve, the two ends of the two opposite sides of the fence net are fixedly provided with connecting blocks, the connecting blocks are provided with inserting openings, the inserting openings are matched with the fixing columns and the L-