In order to improve the stability of motion, environmental suitability and load capacity, and to meet the demands of suspension insulator detection task, this paper presents a novel suspension insulator detection robot mechanism based on biomimetic principles. The configuration of the robot's mechanism is introduced and the working principle and the moving and inspection procedures are analyzed. Equations of kinematics are derived and main dimensions of the robot are given. The kinematic simulation is carried out in the case that the axes of adjacent insulators are misaligned. Simulation results show that the mechanism can adapt to the small⁃angle bending of suspension insulator strings, and it has such advantages as excellent motion stability, environment adaptability and high load capacity. The robot can be applied to the suspension insulator detection task in power transmission lines.