The invention relates to the field of construction buildings, in particular to an anti-pollution mobile construction device for a cable channel. The anti-pollution mobile construction device for the cable channel comprises a feeding device and a mobile bracket, wherein a concrete feeding opening of the feeding device is located in the cable channel and is arranged close to the bottom surface of the cable channel; the mobile bracket is arranged above the cable channel; the feeding device comprises a feed hopper; the feed hopper is located on the mobile bracket; the mobile bracket comprises a base and a rolling mechanism; the base is used for supporting the feed hopper; and the rolling mechanism is located below the base and moves the base along the length direction of the cable channel. The concrete feeding opening of the feeding device penetrates into the cable channel and is close to the bottom surface of the cable channel in the leveling construction process of the bottom surface of the cable channel, so that the drop height of concrete is reduced in the feeding process; the pollution to the inner wall of the cable channel in the concrete feeding process is effectively avoided; and the construction quality is ensured.