The invention relates to a suction-adjustable track type wall-climbing robot comprising a robot body, a track and travelling wheels. The travelling wheels are arranged on the robot body. The track and the multiple travelling wheels are in matched connection through clamping grooves and gear teeth, and the multiple travelling wheels support the track. The suction-adjustable track type wall-climbing robot is characterized in that a plurality of mounting grooves are uniformly formed in the outer wall of each travelling wheel in the circumferential direction, and an electromagnet is embedded into each mounting groove; the centers of the travelling wheels are connected with the robot body through corresponding shafts; mounting cavities are formed inside the travelling wheels; slide rheostat bodies are arranged inside the mounting cavities; metal bars are arranged on the slide rheostat bodies; sliding pieces are slidably connected to the metal bars; one ends of the sliding pieces are connected with one side walls of the side rheostat bodies through first springs, and the other ends of the sliding pieces are connected with sleeves; first through holes are formed in the lower ends of the sleeves; and the parts, between the other sides of the slide rheostat bodies and the sliding pieces, of the metal bars penetrate through the first through holes of the sleeves.