The invention relates to a dense sintering method for a high-voltage breaker quenching nozzle and the high-voltage breaker quenching nozzle, and belongs to the technical field of high-voltage breakers. The dense sintering method for the high-voltage breaker quenching nozzle provided by the invention comprises the following steps: heating a high-voltage breaker quenching nozzle blank to 300-330 DEG C in a vacuum condition, and carrying out heat preservation for 8-12 hours; heating the high-voltage breaker quenching nozzle blank to 350-370 DEG C and carrying out heat preservation for 5-8 hours; and cooling the high-voltage breaker quenching nozzle blank to 300-330 DEG C, carrying out heat preservation for 8-12 hours, and cooling to obtain the high-voltage breaker quenching nozzle. According to the dense sintering method for the high-voltage breaker quenching nozzle provided by the invention, the nozzle blank is sintered and molded by a vacuum sintering method; and the sintering temperature and time are optimized, so that the densification degree of a nozzle material can be improved; the internal porosity of the nozzle material is reduced; and the mechanical property and the electrical property of the material are improved.