The utility model relates to the photography equipment and particularly relates to a digital camera dirt proof sheath solving the technical problem that the dust is easy to fly into the camera during the replacement of the lens of the digital camera. The digital camera dirt proof sheath comprises a dark bag which can be expanded into a cylinder shape and has two openings on two ends; two ends of the dark bag are connected to arm cylinders; one end of the arm cylinder is connected to the port of the dark bag; the other end of the arm cylinder is connected to an elastic edge; a zipper is horizontally arranged on the outer surface of the dark bag; the lining material of the dark bag is red and the surface material of the dark bag is black and the dark bag is formed by sewing the lining material and the surface material; and a light-shielding curtain is arranged inside the zipper. The beneficial effects of the digital camera dirt proof sheath are that the dark bag is compact in structure and provided with the light-shielding curtain to form an intensive and closed space, that the arm cylinders and the arms going inside form close contact so as to effectively prevent the dust from entering the dark bag, and that the dust cannot get into the camera during the replacement of the lens.