The invention discloses a leg-arm-integrated four-legged robot. On the basis of the structure of a traditional crawling four-legged robot, leg-arm-integrating special designing is conducted on one leg branch, and multiplexing of leg and arm functions is achieved. The leg-arm-integrated four-legged robot specifically comprises three common leg branches, a leg-arm-integrated branch and a robot body; each common leg branch has three degrees of freedom, and is responsible for walk rotating; the leg-arm-integrated branch also has three degrees of freedom as the common leg branches when a tail end operating arm is folded, and achieves a walking function; and the tail end operating arm turns into an operating arm with five degrees of freedom after being unfolded and can achieve an operating function.