The present invention discloses an adjuster for the angle of a precision platform and a method for using the same. The adjuster comprises a support structure frame and two adjusting devices; the support structure frame comprises a top plate, a bottom plate and a connecting rod, one end of the connecting rod is connected to the top plate, and the other end of the connecting rod is connected to the bottom plate; the adjusting device comprises a lower base, a ball head rod, a screw rod, an adjusting rod, a connecting rod and an upper base; the ball head end of the ball head rod is movably connected to one end of the lower base, and the other end of the ball head rod is connected to one end of the screw rod; one end of the adjusting rod is hollowly extended along the axial direction, and one end of the adjusting rod is sleeved on the other end of the screw rod, so that the adjusting rod can be adjusted to a preset position along the axial direction of the screw rod; the other end of the adjusting rod is fixed to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the upper base; the present invention arranges adjustable adjusting devices in two intersecting directions, and fixes the adjusting device and the support structure frame on the platform, and uses the support structure frame to adjust the small angle of the platform.