A non-contact intelligent detector comprises a depth limiting plate, a detecting arc and a displacement sensor. The depth limiting plate is fixed to the front end of a grain lifter via a bearing block, the detecting arc is connected with the bearing block by a rocker arm, and the depth limiting plate and the rocker arm are fixedly connected with each other by the bearing block; both the depth limiting plate and the rocker arm can rotate within certain ranges around a shaft on the bearing block; and the displacement sensor is positioned at the rear of the detecting arc on the grain lifter. The distance from the front end of the displacement sensor to the detecting arc ranges from 1mm to 20mm. The depth limiting plate comprises a flat plate and an oblique plate, the flat plate is in contact with the ground, the oblique plate is connected with the bearing block, and an included angle between the oblique plate and the flat plate is 115 degrees. The non-contact intelligent detector has the advantages that owing to the depth limiting plate, the detecting arc and the displacement sensor, change of a vertical position within a large range is linearly transformed into change of displacement within a small range, and accordingly detection is facilitated; a non-contact inductive measurement mode is adopted, so that mechanical friction and abrasion are prevented, and the non-contact intelligent detector is long in service life; and the matching degree between the non-contact intelligent detector and an existing harvest machine is high, and the economical cost is lowered.