Disclosed are an animal fat grading device and an animal fat grading method. The device includes a frame, a barrel, a temperature control device, a collecting part, a compacting part and a collecting and stirring assembly; the frame is fixedly connected with the barrel, the barrel is connected with the temperature control device, the collecting part is located at a bottom of the barrel, the compacting part is located inside the barrel, and a top of the frame is telescopically connected with the collecting and stirring assembly; the collecting and stirring assembly includes a connecting plate, a stirring part and a scraper; the top of the connecting plate is telescopically connected with the top of the frame, and the bottom of the connecting plate is fixedly connected with the stirring part and the scraper; the stirring part is located in a center of the scraper, and the scraper corresponds to the compacting part. The application achieves an objective of grading fats with different melting points.