The utility model discloses a vacuum high temperature piston of brazing, including piston head and piston skirt, piston head and piston skirt are inside all be provided with in cold oil say and the combustion chamber, piston head position in the upper end of piston skirt and the bilateral symmetry of piston skirt be provided with the fill area of brazing, be provided with the brazing filler metal in the fill area of brazing, and adopt brazing process continuous under the vacuum environment of high temperature between piston head and the piston skirt. This product reasonable in design, simple structure, the fault rate is low, and the safety in utilization is good, the brazing filler metal of this product adoption high strength welds piston head and piston skirt under the high temperature environment of vacuum, has not only improved the quality of welding seam, still makes the structural design of piston and the improvement optimization of combustion chamber have more the pluralism, and can say and piston combustion chamber homogenizing wall thickness degree within a definite time by the interior cold oil of more easy assurance to reach good cooling effect.