Precise proportional electromagnetic valve for breathing machine

The invention provides a precise proportional electromagnetic valve for a breathing machine, and the proportional electromagnetic valve comprises a valve seat which is used for connecting a tool; the armature assembly comprises an armature and a sealing block; the sleeve assembly abuts against the valve seat and comprises a sleeve and an iron core. The armature moves in a cavity defined by the sleeve; the coil assembly surrounds and abuts against the sleeve assembly and comprises a framework, a shell and a coil; the adjusting assembly comprises an adjusting rod and a spring and is used for adjusting the pre-tightening force of the armature in the working process; the two ends of the spring abut against a spring hole in the adjusting rod and a spring hole in the armature respectively. The armature is further provided with a through hole, the through hole extends along the spring hole, openings are formed in the two sides of the sealing block, and the through hole is used for improving the medium circulation pe