The invention belongs to the technical field of crop planting devices, and particularly relates to a precise fertilization device based on a multi-point radar, the precise fertilization device comprises a monitoring system, a frame, and a driving system and a spreading mechanism arranged on the frame; the spreading mechanism comprises a lower hopper and a spreading disc disposed below the lower hopper, the upper part of the lower hopper is connected with a fertilizer tank; the monitoring system comprises a controller, a rotation speed detecting system and a radar system arranged on the frame,and the rotation speed detecting system comprises a first rotational speed detector connected with the controller. The driving system comprises a first driver coupled to the controller, the first driver is used for driving the spreading disc to rotate, the first rotational speed detector is used for detecting the rotational speed of the first driver, and the radar system is used for detecting thewidth and the uniformity of a fertilizer spread by the spreading disc. The precise fertilization device can monitor the fertilization status in real time and adjust working parameters in time to achieve precise fertilization, and the environment adaptability is good.