Polyurethane negative pressure foaming mold and forming method thereof

The polyurethane negative pressure foaming mold comprises an upper mold base and a lower mold base, an upper mold is installed below the upper mold base, a lower mold is installed above the lower mold base, the upper mold base and the lower mold base are fixedly connected, and the upper mold and the lower mold are connected in a sealed mode to form a mold cavity. A vacuumizing air pipe enabling a mold cavity to be communicated with the outside in a one-way mode is installed on the upper mold, an upper mold air exhaust groove and a lower mold air exhaust groove are formed in the connecting face of the upper mold and the lower mold respectively, and a sealing groove is further formed in the periphery of the lower mold air exhaust groove. And the upper mold air exhaust groove, the lower mold air exhaust groove and the sealing groove are closed rings matched with the shape of the outer edge of the mold cavity. According to the polyurethane negative-pressure foaming mold and the forming method thereof, negative-pr