The invention discloses an automatic weighing and measuring system for a grain depot, comprising: a weighbridge, a plurality of infrared light curtain detectors to limit a vehicle parking area, a host computer, a waiting area and a camera group are arranged beside the weighbridge, and the host computer is set to: transporting grains The person stays in the waiting area to verify the face information and then swipes the RFID card, the grain transport vehicle stays in the parking area, the camera group does not capture the face, and after the weighing data of the weighbridge is stable, the weighbridge records the weighing data, and the camera group captures the current video at the same time The picture is uploaded to the upper computer respectively; the grain transport vehicle does not stay in the parking area, or the camera group captures the face, or the weighing data of the weighbridge is unstable, the weighbridge does not weigh, and a prompt sound is issued. The invention also discloses an automatic weighing and measuring method for grain depots. The invention can prevent artificial cheating in many aspects, smooth the whole information operation of grain transport vehicles from storage to storage, streamline staff, standardize business process, and realize high-efficiency automatic weighing and measurement.