Mounting calibrator for belt wheel or chain wheel

The utility model discloses a mounting calibrator for a belt wheel or a chain wheel. Two belt wheels are fixedly connected with a body box and a calibration board through a switch magnet, a screw and a nut respectively; a first reference edge is arranged on the body box; three laser pens arranged in the body box are positioned on a first vertical line and emit red laser beams; a laser pen is positioned on a second vertical line and emits blue laser beams; a second reference edge as well as a primary calibration line, a secondary calibration line and an auxiliary calibration line which face the body box are arranged on the calibration board; the distance between the primary calibration line and the second reference edge is equal to the distance between the first vertical line and the first reference edge; the distance between the second reference edge is equal to the distance between the second vertical line and the first reference edge; the auxiliary calibration line is parallel to the second reference edge;