The utility model discloses a novel guide rail for ocean drilling rig, including the bottom backing plate, be provided with the H -beam on the backing plate of bottom, the first -class distance of pterygoid lamina is provided with bilateral symmetry's the hole of walking on the H -beam, under the H -beam on the pterygoid lamina with the corresponding department in hole is provided with the locating hole on foot, be provided with in the locating hole with the locating pin that the bottom backing plate is connected, pterygoid lamina both sides and bottom backing plate both sides are along vertically being provided with at least one corresponding through -hole under the H -beam, wear to be equipped with the connection in the through -hole the stud of H -beam and bottom backing plate, be provided with adjusting shim under the H -beam between pterygoid lamina and the bottom backing plate. The utility model provides a guide rail in use follow -up the deformations persistent ailment that takes place, solved the difficult problem of guide rail flatness error control, solved that the construction degree of difficulty that mesh front rail exists is big, quality control hard, problem long in time limit, the efficiency of drilling rig's operation is improved, the drilling rig operating risk has been reduced.