The invention discloses a device for shooting a stereoscopic video in a left-right eye format, and is used for assisting the shooting of the stereoscopic video in the left-right eye format. The device comprises a terminal provided with a camera, and an optical prism, wherein the camera is arranged at the center of the lower surface of the optical prism, a through hole in a triangular prism shape is formed in the middle part of the optical prism, and first and second hole walls of the through hole as well as left and right side surfaces of the optical prism are coated with a reflective material layer. The device for shooting the stereoscopic video in the left-right eye format is provided by the invention, a left-right eye imaging theory is utilized, images in a left-right eye video format are finally obtained after reflecting an object by means of the optical prism many times, optical imaging effect of the device is good, the shot stereoscopic video in the left-right eye format is realistic, the cost is low, the device can be freely matched with various kinds of terminals having a shooting function in use, and the device is very convenient.