Air purifier installing structure used for rail car

The invention relates to an air purifier installing structure used for a rail car. The air purifier installing structure comprises an air purifier and a chassis. The air purifier is provided with a machine case. A concave pool is arranged at the bottom of the machine case. Guide plates extend out of the left wall and the right wall of the concave pool respectively in the horizontal direction. Hemisphere-shaped grooves are formed in the bottom surfaces of the guide plates. L-shaped sliding rail positioning plates extend upward on the left side and the right side of the top surface of the chassis respectively. Positioning wave bead screws, link stoppers and a positioning spring piece are arranged on the chassis. Positioning beads of the positioning wave bead screws are installed in the hemisphere-shaped grooves in the guide plates in an embedded mode. The link stoppers are connected with the outer side of the front wall of the concave pool in an abutting-against mode. One end of the positioning spring piece is