The utility model discloses a reverse flow forced ventilation geological greenhouse which comprises a plastic film (1) and a biological prefabricated bed (2), wherein the plastic film (1) is an arch structure; the lower end of the plastic film (1) is connected with the earth surface; the two ends of the plastic film (1) are closed to form an inner containing cavity (1a); the biological prefabricated bed (2) is arranged in the inner containing cavity (1a); the inner containing cavity (1a) of the plastic film (1) is connected with a first group of fans (3); air pipe networks (5) are uniformly distributed at the bottom of the biological prefabricated bed (2); the air pipe networks (6) are connected with a second group of fans (4); and small holes are arranged on the surface of each air pipe network (6). According to the utility model, by reducing the bottom pressure of the biological prefabricated bed, oxygen penetrates through the soil at the bottom of the biological prefabricated bed from above to repair the soil, thereby saving energy and protecting environment and avoiding the problem that the soil ploughing influences the health of the operator; and moreover, the reverse flow forced ventilation geological greenhouse is skillful in design, simple in structure, relatively low in cost, etc.