Supercritical reaction still

The invention discloses a supercritical reaction still. The supercritical reaction still comprises an outer barrel and an inner barrel arranged inside the outer barrel, wherein a top plate is fixedlyarranged at the upper part of the inner barrel; the top plate is detachably connected with the outer barrel in a sealing manner; an oxygen inlet and a waste water inlet communicated with the inner barrel are further formed in the top plate; an opening communicated with the outer barrel is formed in the lower part of the inner barrel; at least one salt discharge opening is formed in the bottom of the outer barrel; a salt discharge pipe communicated with the salt discharge opening is arranged at the lower part of the salt discharge opening; a water jacket is arranged around the outer side of thesalt discharge pipe; a closed cleaning cavity is formed among the water jacket, the salt discharge pipe and the outer barrel; a cleaning water inlet is formed in one side of the water jacket; a plurality of water inlet openin