Plastic mold capable of automatically cutting off pouring gate

The invention discloses a plastic mold capable of automatically cutting off a pouring gate. The plastic mold structurally comprises an upper fixed plastic mold body, a pouring pipe, a connecting pipeorifice, a connecting pouring pipe and a second plastic mold body, wherein the pouring pipe is embedded in and connected to the middle of the upper part of the upper fixed plastic mold body, and the connection is reinforced through a bolt I; the connecting pipe orifice is arranged at the upper part of the pouring pipe through high-temperature welding; the connecting pouring pipe is inserted into and connected into the middle of the pouring pipe, and connected with the pouring pipe in an interference fit manner; a positioning pin is arranged on the second plastic mold body; through the positioning pin, the second plastic mold body is fixed to the lower part of the upper fixed plastic mold body; and an upper cover plate is arranged on the pouring pipe, and fixedly connected to the surface ofthe upper part of the pouring pipe through a bolt II. When the plastic mold disclosed by the invention is utilized for pouring production, the pouring gate can be automatically cut off more quickly,thereby improving the working efficiency; and the bottom of the connecting pouring pipe is sealed, thereby effectively avoiding the material waste.