The invention relates to a single leg structure of an electric quadruped robot. The single leg structure comprises a hip joint, a knee joint, a thigh connecting rod, a shank connecting rod and a foot,the hip joint comprises a first hip joint body and a second hip joint body, the second hip joint body is connected with the power output end of the first hip joint body, the knee joint is connected with the power output end of the first hip joint body through the thigh connecting rod, the knee joint is in rigid connection with the second hip joint body, the power output end of the second hip joint body is connected with power input end of the knee joint through the transmission mechanism, the shank is fixedly connected to the power output end of the knee joint, and the foot is connected to the shank. According to the structure, the low quality and low rotating inertia of the thigh and the shank is guaranteed, the good motion performance is achieved, the structure is simple and compact, itis guaranteed that the knee joint and the hip joint of the single leg have the good reverse drive characteristic, and the single leg structure can be used for assembling the electric quadruped robotwhich is capable of bouncing and high in load deadweight ratio.