Crossed cylindrical roller guide rail of instrument lathe

The utility model relates to a crossed cylindrical roller guide rail of an instrument lathe, which comprises a lathe body, a crossed towing plate and an upper towing plate. The crossed cylindrical roller guide rail is characterized in that a cylindrical roller guide rail pair is respectively arranged between the lathe body and the crossed towing plate and between the crossed towing plate and the upper towing plate; each of the cylindrical roller guide rail pairs comprises two guide rails provided with V-shaped raceways; a cylindrical roller is disposed in each V-shaped raceway; each of the cylindrical rollers is provided with a cage; and the adjacent cylindrical rollers with cages are mutually arranged crosswise at an angle of 90 degrees in the V-shaped raceways. The scheme has the benefits that the cylindrical rollers are less in rolling friction resistance, in particular less in start friction force, and good in following property; every two adjacent (alternated) cylindrical rollers are arranged crosswise i