A liquid crystal adjustment device, a liquid crystal display panel and a method for adjusting an amount of liquid crystals in the liquid crystal display panel are provided. The liquid crystal adjustment device includes a liquid crystal accommodation space in communication with a liquid crystal cell in a liquid crystal display panel. The liquid crystal adjustment device injects liquid crystals into the liquid crystal cell when the liquid crystals in the liquid crystal cell are too many, or expels liquid crystals from the liquid crystal cell when the liquid crystals in the liquid crystal cell are too few, to implement the adjustment of the amount of the liquid crystals in the liquid crystal cell, thereby keeping a stable amount of liquid crystals in the liquid crystal cell.