Liquid crystal display panel, manufacturing method thereof and 3D display device

The invention discloses a liquid crystal display panel, a manufacturing method thereof and a 3D display device. A left eye image and a right eye image can be directly separated through a liquid crystal cell, and a manufacturing technology of a naked eye 3D mode liquid crystal cell is simplified. The liquid crystal display panel comprises an upper base plate, a lower base plate and the liquid crystal cell formed by liquid crystal molecules between the upper base plate and the lower base plate. The liquid crystal cell comprises a displaying layer and an optical grating layer which is arranged close to the upper base plate. The optical grating layer comprises a light blocking zone and a light-transmitting zone. The light blocking zone comprises light blocking liquid crystal molecules. The light-transmitting zone comprises light-transmitting liquid crystal molecules. The light blocking zone and the light-transmitting zone are arranged at intervals.