The invention discloses a clamping obstacle-surmounting mechanism for high-voltage lines, and the mechanism comprises an upper clamping mechanism and a lower clamping mechanism, wherein the upper clamping mechanism is connected with an upper traveling wheel, the lower clamping mechanism is connected with a lower traveling wheel, the upper clamping mechanism and the lower clamping mechanism are respectively provided with a central tube, a central rod which can slide along the central tube is arranged in each central tube, a spring is sleeved on each central rod, and the upper traveling wheel and the lower traveling wheel are respectively connected with the corresponding central rods, and can overcome the elastic forces of the springs and shift in the vertical direction when encountering an obstacle. The lower clamping mechanism is also connected with a synchronous scalable mechanism, the synchronous scalable mechanism is provided with a connecting rod connected with the central rods, the other end of the connecting rod is provided with a handle, the lower clamping mechanism can be used for clamping and removing the high-voltage lines through pulling the handle upwards and downwards. According to the invention, when the clamping obstacle-surmounting mechanism is used together with a travelling mechanism, the clamping obstacle-surmounting mechanism can easily surmount obstacles such as spacing rods or wire clips on the high-voltage lines; when the clamping obstacle-surmounting mechanism for the high-voltage lines is used in a high-voltage line routing inspection device or a deicing device, the routing inspection or deicing efficiency of the high-voltage lines can be greatly improved.