The invention relates to a mechanical leg for a mobile platform, belongs to the technical field of mobile carriers, and solves the problems that in the prior art, torque change is generated at the moment of forward and reverse rotation of a motor of a mechanical
leg type mobile platform, the mechanical leg vibrates in the operation process, frequent forward and reverse rotation switching can cause large
impact on a
mechanical transmission part, and the service life of the mechanical leg is influenced. And the abrasion of parts is accelerated. The
robot comprises a driving unit, a
thigh unit and a shank unit, the driving unit can be connected with a moving platform, the
thigh unit is connected with the driving unit, and the shank unit is arranged on the
thigh unit. When the first motor of the mechanical leg rotates, the driving rod can be driven to rotate around the output shaft of the first motor, and the transmission rod is driven to do
reciprocating motion; the first motor does not need to be switched between forward rotation and reverse rotation, and torque change cannot be generated frequently. Vibration of the mechanical leg and
impact on a
mechanical transmission part can be avoided, and part abrasion is relieved.