The invention relates to the technical field of robots, and discloses a
humanoid robot lower limb system, comprising: a
crotch portion comprising a
rope-driven motor; the thighs are installed at the two ends of the
crotch respectively and can rotate along a
pitch axis and a roll axis; the shanks are installed at the lower ends of the two thighs respectively, a
knee joint motor is installed on the upper portion of each
thigh, and the shanks are driven to rotate relative to the thighs through the
knee joint motors and the synchronous belts; the ankles are mounted at the lower ends of the two shanks respectively; the
rope drive motor drives the shank opposite to the
ankle to rotate through the steel
wire rope. The synchronous belt has the characteristics of
high transmission precision and strong anti-interference capability in a non-severe environment, the
rope drive has the characteristic of high sensitivity, and all motors are intensively arranged at the uppermost end of the leg structure, so that the center of gravity is concentrated on the upper part, the
inertia of leg movement is reduced, and the
movement control is facilitated. Meanwhile, the principle that the left leg and the right leg are designed into blocks is adopted, so that the left leg and the right leg can rotate independently, and walking in multiple terrains is facilitated.