The invention discloses an air magnetizing energy-saving emission-reducing device for engine inlet air. The air magnetizing energy-saving emission-reducing device comprises a magnetizer arranged in a housing, wherein the magnetizer comprises a first permanent
magnet, a first magnetic conductive
metal plate, a second magnetic conductive
metal plate, a non-magnetic material plate, a shielding sleeve and a shielding layer; the first magnetic conductive
metal plate, the second magnetic conductive metal plate and the non-magnetic material plate are sequentially in
lap joint; a first cavity is formed in the middle parts of the first magnetic conductive metal plate, the second magnetic conductive metal plate and the non-magnetic material plate; a shielding layer through hole is formed in the middle of the shielding layer; one end surface of the first magnetic conductive metal plate is in
lap joint with a first permanent
magnet, and the other end surface of the first magnetic conductive metal plate is in
lap joint with the shielding layer; and the first permanent
magnet, the first magnetic conductive metal plate, the second magnetic conductive metal plate and the non-magnetic material plate are arranged in the shielding sleeve. According to the air magnetizing energy-saving emission-reducing device for the engine inlet air, after being magnetized, air molecules enter a
combustion chamber, and the air molecules are quickly promoted to be tightly combined with fuel molecules, so that the fuel is sufficiently combusted to achieve better energy-saving emission-reducing effects.