Concrete unloading control method and device and mixer truck

The embodiment of the invention provides a concrete unloading control method and device and a mixer truck, and belongs to the technical field of engineering machinery. The method comprises the steps that when it is determined that the mixer truck is in an unloading state, the first gravity of concrete in a main groove is obtained through a gravity sensing device; when the first gravity exceeds a gravity threshold value, a first image of the main groove is obtained through a visual sensing device, and the first material accumulation height of the concrete is determined according to the first image; and when the first accumulated material height exceeds the height threshold value, a vibration device is started, and the vibration device is used for driving the main groove to generate vibration. According to the process, when it is determined that the mixer truck is in a discharging state, the gravity of concrete in a main groove is obtained through a gravity sensing device, when the gravity exceeds a gravity thr