The invention relates to automatic maintaining equipment for a high-speed rail. The automatic maintaining equipment comprises a rail moving base which has an automatic rail moving and detecting function. A rail impurity removing device is mounted in the middle of the lower end face of the rail moving base and has an automatic impurity removing function for the middle of the rail. A rail tree trimming device is mounted on the upper end face of the rail moving base and has an automatic trimming function for rail protecting trees. The rail moving base comprises a base plate, two rows of moving support columns are symmetrically mounted in the middle of the lower end face of the base plate, a moving base platform is welded to the lower ends of the two rows of moving support columns, and the two rows of moving support columns play a role in uniformly supporting the moving base platform. Two rows of fixed columns are symmetrically welded to the two ends of the moving base platform, and two movable traveling devices are mounted on the two sides of the two rows of fixed columns correspondingly. The automatic maintaining equipment has the all-in-one automatic maintaining function of rail condition detection, tree trimming and impurity removal.