Efficient energy-saving building system based on BIM

The utility model relates to the technical field of energy-saving building systems, and discloses a BIM-based efficient energy-saving building system which comprises a wallboard and a bracket, the inner wall of the wallboard is fixedly connected with a ventilation shell, the inner wall of the ventilation shell is fixedly connected with a support plate, the front face of the support plate is fixedly connected with an air inlet fan, and the left side face of the wallboard is fixedly connected with a controller. The right side face of the bracket makes contact with the left side face of the wallboard, the inner wall of the bracket and the inner wall of the wallboard are jointly in threaded connection with two sets of fixing bolts, the left side face of the bracket is fixedly connected with a clamping base, and a temperature sensor is clamped in the clamping base. By arranging the temperature sensor and the wind speed sensor, outdoor temperature and wind speed can be detected, circulation of outdoor air and indoo