The invention discloses a hog house fresh air, temperature and humidity regulation and control system. The hog house fresh air, temperature and humidity regulation and control system comprises a roof, a plastic film greenhouse, a supporting member, a fermentation bed and a platform, wherein periphery of a hog house is enclosed by brick walls, the wall of the hog house is provided with a wall interlay air channel, the connection portion of the wall interlay air channel and the hog house is provided with an air supply outlet, the upper portion of the hog house comprises the roof, the supporting member and the plastic film greenhouse, the upper portion of the plastic film greenhouse is provided with a sunshading screen cloth, the roof is provided with an electrical air exhaust port and an axial-flow blower fan, a shady face wall of the hog house is provided with a ventilation window, the fermentation bed and the platform are at a central position of the hog house, soil below the fermentation bed and the platform is provided with heat exchange air channels, and ground portions of the heat exchange air channels are provided with air inlets and filter nets. A summer air exchange and heat radiation process is a natural convection heat exchange process, forced mechanical air exhaust is not necessary, outdoor hot air is cooled and dehumidified through the ground soil and is then sucked into the hog house, fresh air exchange is further realized, no energy consumption is realized in the process, and the cooling effect is excellent.