The invention discloses an automatic weighing instrument integrated detecting device. A feeding system provides powder or granular materials for a to-be-detected gravity type automatic loading weighing instrument; weighing is carried out; after weighing completion, materials fall into a container through a blanking pipe and the materials are conveyed to a detection station by a conveying line; a detection system weighs the weight of the materials in the container; the conveying line is started and the container is conveyed to a next station; a liquid injection system caries out liquid injection on a filling scale and the filling scale carries out liquid injection on the container again and the weight is weighed; after weighing completion, a second automatic conveying line transports the container to the detection system and then the liquid injection system returns; the detection system weighs the weight of the materials in the container in an upgoing manner; and after weighing completion, a first automatic conveying line conveys the container to a next station and then the detection system returns. Therefore, the automatic detection of the dynamic weighing performance of the automatic weighing instrument is realized.