A light-weight and high-load-ratio robot body framework comprises a battery mounting layer, a butterfly-like bearing plate and a load mounting layer which are sequentially connected from the bottom to the top, wherein the battery mounting layer is located in the middle of the bottom surface of the butterfly-like bearing plate; sensor mounting positions corresponding to each other are separately mounted at the left and right sides of the battery mounting layer; a battery mounting framework is arranged between the two sensor mounting positions; electric wiring holes and heat radiating holes are arranged in the battery mounting framework; the butterfly-like bearing plate comprises a central plate; the front end of the central plate is provided with a left front support plate, a front support plate and a right front support plate, which are integrally formed with the central plate; and the rear end of the central plate is provided with a left rear support plate, a rear support plate and a right rear support plate, which are integrally molded with the central plate. The robot body framework has the advantages that the gravity center of a robot body is low, and the self weight of the robot body is light; the load bearing capability of the robot body is strong, the deformation of the robot body in a long-term use process is small, and the tenacity is great; a large number of sensors and bridges are accommodated, and the load ratio of load to the robot body is high; and assembly and disassembly are easy, and the maintainability is great.