The invention relates to a high-pressure gas quenching furance, and relates to the field of quenching equipment. A gas quenching chamber of the high-pressure gas quenching furnace is a spherical cavity formed by a shell. A plurality of jet nozzles used for jetting gas media into the gas quenching chamber are arranged in the gas quenching chamber, and distributed uniformly inside the spherical cavity gas quenching chamber in the circumferential direction. Meanwhile, workpiece supports are arranged nearby the jet nozzles, the gas media entering the gas quenching chamber can make contact with to-be-treated workpieces under the conditions of maximum flow velocity and maximum air pressure, the maximum gas quenching effect of the gas media is achieved accordingly, and the purposes of shortening the gas quenching time and reducing energy consumption are achieved. Furthermore, a main workpiece support is arranged in the center of the spherical cavity, and a workpiece of a large size can be treated; and when the main workpiece support is used, a mixer at the bottom of the spherical cavity can be started to optimize the gas flow velocity.