The utility model provides a cell filter, the novel nipple rectifier comprises a cylindrical shel, the barrel lower part is the toper structure, barrel toper structure inner wall is equipped with filtration membrane, the barrel bottom surface is the opening, installation filter screen in the opening, the bottom of the barrel top fixed connection type of falling U ring is inboard, barrel and the type of falling U ring structure as an organic whole, the test tube top can be inserted to the opening of the type of falling U ring in, barrel upper portion outer wall is equipped with the several through -hole, outer wall that the through -hole used the barrel is central evenly distributed, barrel inner wall lower part both sides are the one end of fixed connection obliquely connecting rod respectively, the outer wall middle part of the other end fixed connection toper cap of connecting rod, insert to the barrel lower part toper structure in the bottom of toper cap, and the inner wall of toper cap contactless barrel. The through -hole makes cell suspension only can fall into the in vitro under the action of gravity, and the cell suspension priority is through twice filtration, and than individual layer filter, the filter effect is better.