Die casting machine and local high-pressure cooling device thereof

The utility model relates to the technical field of die equipment, and discloses a local high-pressure cooling device and a die-casting machine, and the local high-pressure cooling device comprises a cooling water pressurizing assembly which comprises a water tank and an oil cylinder, the water tank is provided with a water inlet end and a water outlet end, the oil cylinder comprises a cylinder body, a driving rod and a piston, the cylinder body is connected with the water tank, and the tail end of the driving rod extends into the water tank; the piston is mounted at the tail end of the driving rod and is in sealing joint with the inner peripheral wall of the water tank; one end of the water inlet pipe is connected with a cooling water source, the other end of the water inlet pipe is connected to the water inlet end, and the water inlet pipe is connected with a first one-way valve only allowing cooling water to flow into the water tank; one end of the water outlet pipe is used for being connected with a cooli