According to the distribution characteristics and the inspection requirements of 500 k V super-high voltage transmission line,the mechanical structure of a new inspection robot with four arms is introduced.Based on this,the kinematical simulation and kinematic analysis of the obstacle-navigation process are conducted by using ADAMS.Through the repeated scene simulation experiments,it is verified that the robot not only can stably span the four splitting interval rods,suspension clamps and shockproof hammers and other obstacles,but also can span these obstacles with high efficiency and has the strong climbing ability.