The invention discloses an obstacle crossing device of an inspection robot for a four-bundled power transmission line. The obstacle crossing device of the inspection robot for the four-bundled power transmission line comprises a driving wheel mechanism arranged at the top of a cable, and two driven wheel mechanisms arranged below the cable in the oblique directions, the driving wheel mechanism is firmly connected with the driven wheel mechanisms through first connecting bars, and a pedestal is connected below the driven wheel mechanisms through second connecting bars; the driving wheel mechanism comprises at least two first transmission wheels, a drive motor is arranged in any one of the first transmission wheels, the first transmission wheels are connected through a chain mechanism, each first transmission wheel is fixed on a first fixing rack, and two adjacent first fixing racks are hinged to each other; each driven mechanism comprises at least two second transmission wheels connected through a chain mechanism, each second transmission wheel is fixed on a second fixing rack, and two adjacent fixing racks are hinged to each other. The obstacle crossing device of the inspection robot for the four-bundled power transmission line is capable of improving the disadvantages of the prior art; by means of the driven type obstacle crossing structure, the structure is simple, and the reliability is high.