Automobile exhaust emission purification device

The automobile exhaust emission purification device comprises a machine body rotationally connected to an exhaust pipe in a sleeving mode, and a plurality of air outlet holes used for discharging purified gas are formed in the surface of the machine body; a locking assembly is arranged at one end of the machine body and comprises four mounting plates fixedly mounted at one end of the machine body in a circumferential shape, four first spring rods fixedly mounted on the surfaces of the four mounting plates correspondingly and four arc-shaped locking blocks fixedly mounted at the bottom ends of the four first spring rods, and mounting grooves are formed in the lower surfaces of the mounting plates; a second spring rod is horizontally and fixedly mounted in the mounting groove, a first inclined block is fixedly mounted at one end of the second spring rod, the first spring rod is fixedly sleeved with a second inclined block, and the second spring rod is clamped through a clamping part. The engine body and the aut