The invention discloses a miniature moving-magnet exciter, which mainly comprises a linear motor assembly, a compressor assembly and a suspension assembly, wherein the linear motor assembly comprises a concentric magnet yoke pair, a magnet exciting coil and a permanent magnet ring; the permanent magnet ring is formed by alternately stacking annular axial magnet charging bodies and radial magnet charging bodies; a cylinder in the compressor assembly is fixed in a center ring of the magnet yoke pair through a cylinder saddle, a piston is positioned in the cylinder, and the magnet yoke pair is suspended and fixed on the cylinder saddle; the suspension assembly is a plate spring which is formed by cutting an involute of a circle, and the involute extends to the outer diameter of the plate spring to divide the plate spring into three cantilevers; adjacent cantilevers are connected into a whole through an elastic hold-down ring; and the bottom of the piston is fixed at the center hole of the plate spring. By means of a plate spring suspension structure and a magnet yoke positioning mode, when the miniature moving-magnet exciter is assembled, the concentricity can be flexibly adjusted, and the processing requirement on parts is reduced, so that the whole device has a simple structure; and the mold line of the plate spring is improved, so that the stability of the moving-magnet exciter is stronger and the service life thereof is longer.