Extraction tank

The utility model discloses an extraction tank which comprises an extraction tank body with a top cover at the top, a rotating shaft and a reciprocating screw rod which extend into the extraction tank body are arranged on the top cover, the rotating shaft and the reciprocating screw rod are arranged in parallel, a spline shaft positioned in the extraction tank body is arranged at the end part of the rotating shaft, and the spline shaft and the reciprocating screw rod are arranged in parallel. The spline shaft is provided with an outer shaft barrel moving along the spline shaft, the outer shaft barrel is provided with a material turning auger sheet which is spirally arranged upwards, the outer shaft barrel is provided with a stirring rod, the reciprocating screw rod is provided with a moving block which moves up and down along the reciprocating screw rod, and the upper end of the outer shaft barrel is provided with a rotating ring block through a bearing; the rotating ring block is connected with the moving bl