The invention relates to a spiral laser mechanical assembly precision corrector and a correction method thereof. The corrector comprises a control processing chip, a laser measuring unit, a communication module, a serial port module, a functional module interface, a time logic component, a first counter, a second counter, a first crystal oscillator, a second crystal oscillator, a register module,a power source, a first weight sensing component, a second weight sensing component, an oscillation sensing component and a plane laser measuring and controlling unit; the control processing chip judges whether a mechanical assembly is in the stable state or not according to balance state information and shaking state information; seventh to ninth laser measuring control components position a mechanical assembly in three-dimensional space coordinates, first to sixth laser measuring control components send six sets of laser signals, whether the six sets of laser signals are located on the samelogic straight line or not is judged through the control processing chip, and if the six sets of laser signals are stabilized on the same logic straight line, the mechanical assembly is calibrated. The equipment operation precision can be improved, and the equipping and machining exquisite degree is controlled.