The invention discloses a reducing mechanism for a spring machine, which comprises a mechanical part and an electric control part, wherein the mechanical part comprises a cam assembly, a first swing rod assembly, a second swing rod assembly, a first slide block assembly, a second slide block assembly and a third slide block assembly, wherein the cam assembly is formed from a first cam and a second cam which are coaxially installed, the first cam is positioned at the outer end, and the second cam is positioned at the inner end; the first swing rod assembly and the second swing rod assembly are respectively correspondingly placed at both sides of the cam assembly and can contact the second cam; the first slide block assembly and the second slide block assembly respectively contact the end parts of the first swing rod assembly and the second swing rod assembly; the third slide block assembly directly contacts the first cam and is placed between the first slide block assembly and the second slide block assembly; each slide block assembly comprises a slide block and a slide seat, wherein a sliding slot is arranged in the middle of the slide seat, and the slide block is placed in the sliding slot and can slide in the sliding slot; a top spring rod is installed on the slide block, and a top spring bearing is installed at the end part of the top spring rod; and the electric control part comprises an electronic control unit and a servo motor, wherein the servo motor is respectively connected with the first cam and the second cam through a retarding mechanism and provides steering power when necessary.