The invention relates to an intelligent ammeter clock calibration method aims at utilizing conventional resources of a single chip microcomputer to realize wide-range high-precision error correction. The technical scheme includes: a, measuring frequency deviation values of different temperature points, and simulating a temperature-frequency deviation curve; b, determining a minimum correction value of coarse tuning, and utilizing a formula obtained in step a to calculate out frequency deviation at current temperature as a compensation value; c, if the compensation value is smaller than the minimum correction value of the coarse tuning, executing step g, or executing step d; d, if M is 2, 3, 4 or 5, executing step e, or executing step f; e, using an internal pulse counter to perform pulse counting to signals output by a crystal oscillator, coarse tuning, and executing step g; f, performing frequency multiplication or frequency demultiplication to the signals output by the crystal oscillator to obtain a signal Ft; and g, arranging a controllable capacitor array at an output end of the crystal oscillator.