The utility model relates to a rail locking device, particularly a gripping rail anti-creeping device. The utility model is composed of a convex rail anti-creeping clamp, a concave rail anti-creeping clamp, screw bolts, pads and screw nuts. The clamping force of an anti-creeping device to rails is increased because of the adoption of separate structure and bolt joint. The utility model has the advantages of simple structure, convenient operation, large clamping force, less capability of break, long service life, servicing time saving and manpower saving, and the utility model can effectively prevent rails from creeping.