The invention belongs to the technical field of railway rails, and particularly relates to a rail adjusting machine for a rail. The rail adjusting machine for the rail achieves multi-station simultaneous measurement adjustment and long-distance steel rail section continuous adjustment. The rail adjusting machine for the rail comprises walking units, an adjusting unit, a support and a rail clamping device. The walking units are installed at the two ends of the support. The adjusting unit is fixed to the support. The rail clamping device is connected to the adjusting unit. The adjusting unit comprises a vertical lifting adjusting motor, a parallel movement adjusting motor, an angle inclination adjusting motor, a rail grasping adjusting motor, an adjusting platform, a center shaft and a movable rail clamping platform. A vertical lifting mechanism extends, and an adit guide mechanism is additionally arranged so that the rail above the concrete ground plane can be adjusted. Besides, the rail 600 mm below the concrete ground plane can be adjusted, and the application range is widened.