The invention relates to a crawler combine harvester low-speed work linear tracking method comprising the following steps that the initial course direction of a harvester and the angle and the vertical distance between the initial course direction and a target course are determined through a GPS and an attitude sensor; the crawler of one side of the harvester is locked so that the harvester is enabled to perform in-situ steering until the inclined angle between the harvester and the target course is 60 degrees; the harvester linearly moves to the position near the target course; the crawler of one side is locked again so that the harvester enabled to perform in-situ steering to the target course; and the harvester linearly moves and adjusts the course direction in time when the harvester deviates out of the range. The crawler combine harvester low-speed work linear tracking method is reasonable in design and easy to operate, and rapid linear tracking can be realized through the process of quick approaching and then fine adjustment so that the number of times of course direction adjustment can be reduced and driving of the vehicle is enabled to be more smoothly.