Abstract: A universal precise leveling measuring device and measurement method thereof, comprising: a plate-shaped horizontal base, a round bubble level set at the center of an upper surface of the base, and three outriggers set on the base, wherein at least one through-hole is set at one end of each of the outriggers far from the base, and a point contact bolt set in the through-hole; the three outriggers are extended in different directions and in the same plane parallel to the base, and included angle of two adjacent outriggers is smaller than 180°. With the universal precise leveling measuring device of the present invention, the prior art manual levelness measurement of foundation flange of wind power generator carried out by using a scale and a level is modified into dynamic measurement only by using the universal precise leveling measuring device, thus increasing the measurement precision and simplifying the measurement procedures.