The invention provides a method and a device for transmitting a three-dimensional depth images, wherein the method comprises the steps of acquiring a plurality of frames of three-dimensional depth images through a three-dimensional image acquisition device; determining redundant information which is contained in the plurality of frames of three-dimensional depth images; eliminating the redundant information contained in the plurality of frames of three-dimensional depth images from the plurality of frames of three-dimensional depth images; and transmitting the three-dimensional depth images after redundant information elimination to a terminal. According to the method and the device, the redundant information contained in the three-dimensional depth images are eliminated before transmitting the three-dimensional depth images to the terminal, thereby greatly reducing size of transmitted data, saving transmission bandwidth, and greatly preventing discontinuous transmission when network instability occurs.