The invention provides a precise biogas slurry application device. The precise biogas slurry application device is mainly composed of a lower water tank (1), a higher water tank (2), a water pump (4)and corresponding pipes. By means of the device and a using method thereof, the purposes of precise biogas slurry application, environmental friendliness and safety can be achieved, and the precise biogas slurry application device has the advantages of being simple in structure, convenient to control, precise in measurement and the like.