The present invention belongs to the technical and processing field of agricultural products, and particularly relates to a pretreatment processing device and pretreatment processing technology of poria cocos. The device comprises an outer box body (1), an inner box body (2), a gas flow circulating unit, a water draining unit and a control unit. Universal wheels (5) are arranged on the bottom of the outer box body (1); a box body door is arranged at the side surface of the outer box body (1); the inner box body (2) is placed inside the outer box body (1) and the outer surface of the inner box body (2) and the inner surface of the outer box body (1) are apart from each other by a certain distance; the inner box body (2) presents an opening shape and a plurality of holes are evenly distributed on the side walls and the bottom plate; stand feet (6) are arranged on the bottom part of the inner box body (2); and a moisture absorbing hair felt (3) is laid evenly within the inner box body (2). The device is high in efficiency, convenient in use, water-saving, energy-saving, environmentally protective and automatically controlled. The preprocessed poria cocos is high in active ingredient contents and easy to store and transport in the later period.