The utility model relates to an improved fan regulating door opening and closing device, and belongs to the field of accessories of fans. The technical problem that the existing fan regulating door opening and closing device is low in transmission precision, light in weight and high in cost, and is plump is solved. According to the technical scheme for solving the technical problem, the improved fan regulating door opening and closing device comprises a fan regulating door, a fan regulating door push rod, an electric push rod and a fixing support, wherein the fan regulating door push rod is arranged on the fan regulating door; the electric push rod is used for controlling opening and closing of the fan regulating door; the fixing support is used for supporting the electric push rod and is fixedly connected with the fan regulating door; the head of the electric push rod is connected with the fan regulating door push rod; and the tail of the electric push rod is fixedly connected with the fixing support. The improved fan regulating door opening and closing device has the advantages of high transmission precision, simple and compact structure, light weight and low production cost.