The invention discloses an endoscopic surgery system aiming at endometrial repair and applications of the endoscopic surgery system, belonging to the technical field of medical apparatus and instruments. The system comprises a multi-cavity sleeve with a plurality of processing channels, a visible imaging system, a sacculus placement apparatus, a flexible apparatus and the like, wherein the multi-cavity sleeve is provided with a large processing channel, a visible endoscope channel, flexible apparatus channels and water outlet channels; the visible imaging system is used for providing a visible environment in the endometrial repair process, and is placed in the visible endoscope channel; the sacculus placement apparatus is used for conveying a collagen membrane into the uterus, spreading the collagen membrane, keeping the attaching state of the collagen membrane and the uterus wall, and conveying the collagen membrane into the uterus through the large processing channel of the multi-cavity sleeve; the flexible apparatus is used for enabling the collagen membrane to reach the preset repair position and flat spreading the collagen membrane after the collagen membrane is placed into the uterus. With the endoscopic surgery system, the examination for the uterus wall, the placement and spreading of the collagen membrane, the tight attaching of the collagen membrane to the uterus wall and other operations can be realized under the visible condition, and therefore, the surgery success rate and efficiency are greatly improved.