The invention provides a diversion device, a diversion control system, a diversion control method and a vehicle, wherein the diversion device includes: a fixed bracket fixedly installed on a fixing device at one end of the vehicle close to the ground; The first end of the windshield is rotatably connected to the fixed bracket, and the second end opposite to the first end on the windshield is arranged correspondingly to the bottom guard of the vehicle. When the windshield rotates around the fixed bracket, the windshield is on the second Switch between the first state where the end is overlapped and sealed with the bottom guard plate, and the second state where the second end is not overlapped with the bottom guard plate. In the technical solution of the present invention, the deflector is switched through the state of the windshield, so that the deflector has the protection of the fender, optimizes the NVH performance of the whole vehicle, improves the passability of the front end of the vehicle, and reduces the airflow entering the interior of the car. Form turbulent flow, adjust the air pressure at the bottom of the vehicle, so that the vehicle has good aerodynamic performance, and meet the needs of users for different functions in different environments.