The invention provides a trimming and automatic sorting system for automobile door aluminum hinges. The system comprises a trimming tool, a storage platform, a material pushing tool, a slide way, conveying devices and product collection frames. The trimming tool is used for cutting off flanges, left after machining, of the completely-machined automobile door aluminum hinges. The automobile door aluminum hinges with the flanges cut off enter the bottom of the trimming tool. The storage platform is arranged at the bottom of the trimming tool and is used for containing the automobile door aluminum hinges subjected to complete trimming on the trimming tool. The material pushing tool is located at one end of the storage platform and used for pushing out the automobile door aluminum hinges on the storage platform. One end of the slide way is connected with the other end of the storage platform. The conveying devices are connected with the other end of the slide way. The conveying devices include the left station conveying device and the right station conveying device. The left station conveying device and the right station conveying device are used for conveying the automobile door aluminum hinges conveyed form the slide way. The product collection frames are located at the bottom of the left station conveying device and the bottom of the right station conveying device correspondingly and used for collecting the automobile door aluminum hinges output from the left station conveying device and the right station conveying device.