The invention discloses a lubricating oil way for a gearbox. The lubricating oil way comprises a first lubricating oil way body, a second lubricating oil way body, a third lubricating oil way body, a fourth lubricating oil way body and a fifth lubricating oil way body which are used for lubricating different components in the gearbox respectively. According to the lubricating oil way for the gearbox, new oil supply ways are additionally arranged special for the different components in the gearbox, the components are not just lubricated through oil supply holes of a transmission shaft any more, lubricating oil can sufficiently flow into the gearbox, and therefore the whole gearbox is fully lubricated.