The invention discloses a micrometering ball preparation and monitoring device, comprising four parts consisting of a magnetic field generation system, a three-dimensional displacement adjusting mechanism, a wire feeder and an image monitoring system. The magnetic field generation system is mainly composed of a U-shaped electromagnet; the three-dimensional displacement adjusting mechanism comprises a two-dimensional translation platform, a one-dimensional translation platform, a tungsten wire guiding tube and a sparking plug. The wire feeder comprises a driving wheel, a clamping roller, a wire feed roller and a material supplying part. The image monitoring system comprises a microscopic objective, a third generation infinite distance light structure lens and a bracket. The micrometering ball preparation and monitoring device solves the problem of eccentricity of the tungsten ball and tungsten column, and also solve the problem of the affect of gravity on sphericity. The sphericity and eccentricity precisions are improved, and monitoring on the dynamic forming process of the ball becomes possible.