Polypropylene sheet

The invention belongs to the technical field of sheets, and particularly relates to a polypropylene sheet, which comprises a sheet body. The sheet body is divided into an outer layer surface and an inner layer surface; reinforcing cavities are formed in the sheet body in the length direction; the reinforcing cavities are uniformly arranged in the width direction of the sheet body; the sheet body is provided with a fireproof cavity which is inclined towards the inner layer surface at the reinforcing cavity; the fireproof cavity is communicated with the reinforcing cavity; the fireproof cavity extends to the lower part of the adjacent reinforcing cavity; a fireproof column is fixedly mounted in the reinforcing cavity; one end, close to the fireproof cavity, of the fireproof column extends into the fireproof cavity; a plurality of pull ropes are fixedly connected into the sheet body; one end of each pull rope is fixedly connected with the surface of one side, close to the inner layer surface, of the correspondin