The invention provides a crankshaft oil sealing device and an automobile engine and relates to the technical field of engine oil sealing. The crankshaft oil sealing device comprises a movable rail assembly and a fixed rail assembly, wherein the movable rail assembly comprises a movable rail body and a movable rail blade; the movable rail body is used for being connected with a crankshaft and can rotate along with the crankshaft; the movable rail blade is arranged on the outer edge of the movable rail body; the fixed rail assembly comprises a fixed rail body and a fixed rail blade; the fixed rail blade is used for being connected with a crankcase or a crankshaft end cover; the fixed rail blade is arranged on the inner edge of the fixed rail body; when the movable rail assembly and the fixedrail assembly are mounted in a matching manner, the movable rail blade and the fixed rail blade are staggered, and a clearance exits between the movable rail blade and the fixed rail blade. The crankshaft oil sealing device relieves the problem in the prior art that an oil seal is likely to age and lose efficacy due to larger frictional force between the oil seal and the crankshaft.