Experimental system and method for anti-reflection of ultra-low permeability compact shale by using supercritical CO2

The invention discloses an experiment system and method for increasing permeability of ultra-low permeability compact shale by using supercritical CO2, the system comprises a CO2 gas cylinder, a surge tank, a core holder, a CO2 recovery tank and a shale gas collection kettle which are connected in sequence, also comprises a hydraulic pressure pump connected with the core holder, and also comprises a first water bath box and a second water bath box; the surge tank is arranged in the first water bath box; and the core holder is arranged in the second water bath box. According to the invention, the surge tank and the rock core holder are arranged in different water bath boxes, and the water bath boxes are also provided with temperature control heaters, so that accurate temperature control can be realized, and CO2 can be ensured to be in a supercritical state when being injected into the rock core holder by accurately monitoring the temperature and pressure conditions of the surge tank; the whole equipment is rea