The utility model discloses an open-type spiral swing balling prevention centering device for well drilling. The open-type spiral swing balling prevention centering device for well drilling comprises a tubular centering device body (21), the outer wall of the middle section of the centering device body (21) is provided with at least one spiral centering swing (31), a mud block cutting belt (32) extending along the spiral centering swing (31) is arranged on one side of the spiral centering swing (31), and the preset distance is kept between the mud block cutting belt (32) and the outer wall of the centering device body (21). According to the open-type spiral swing balling prevention centering device for well drilling, due to the fact that the mud block cutting belt is arranged on one side of the spiral centering swing, when mud blocks scraped by the spiral centering swing gather to a certain degree, the state of continuing to form a large-block mud drum can be changed by the mud block cutting belt, the mud blocks can change into a relatively-long state; the mud blocks can be pushed to the lower portion of the mud block cutting belt when gathering more and more, then, the mud blocks can be flushed away by high-speed liquid flow, and therefore balling on the centering device can be prevented.