NOVELTY - A metominostrobin is prepared by (A) acylating synthesizing step, (B) cyan hydrolyzing step, (C) hydroxyl oximing step, and (D) methylating step. The step (A) comprises adding diphenyl ether, diacetonitrile and solvent to reaction unit, reacting for 3 hours at temperature of - 30-10 degrees C, heating at room temperature for 5-10 hours, pouring reactant to ice water, obtaining 2-(phenyl) benzoyl cyanide via extracting, drying and concentrating. The step (D) comprises reacting 2-(2-phenoxyphenyl)-2-hydroxyimino-acetamide, dimethyl sulfate, and phase transfer catalyst tetrabutyl ammonium bromide.    USE - Method for preparation of metominostrobin (claimed).    ADVANTAGE - The method shortens reacting steps and time, improves total efficiency by improving technology, avoids toxic chemicals potassium cyanide used in traditional technology, and realizes cleaner production.    DETAILED DESCRIPTION - Metominostrobin is prepared by (A) acylating synthesizing step, (B) cyan hydrolyzing step, (C) hydroxyl oximing step, and (D) methylating step. The step (A) comprises adding diphenyl ether, diacetonitrile and solvent to reaction unit, reacting for 3 hours at temperature of - 30-10 degrees C, heating at room temperature for 5-10 hours, pouring reactant to ice water, obtaining 2-(phenyl) benzoyl cyanide via extracting, drying and concentrating. The step (B) comprises adding 2-(phenyl) benzoyl cyanide, acid or alkali to reaction bulb, adding water, hydrolyzing at 5-30 degrees C, extracting with ethyl acetate, washing, finally drying with magnesium sulfate and obtaining 2-(2-phenoxyphenyl)-2-oxo acetamide. The step (C) comprises reacting 2-(2- phenoxyphenyl)-2-oxo acetamide, hydroxylamine sulfate or hydroxylamine hydrochloride, toluene solvent at 30-100 degrees C for 3-6 hours; and after finishing reaction, extracting with toluene, washing with water, drying, evaporating solvent, refining and obtaining 2-(2-phenoxyphenyl)-2-hydroxyimino-acetamide. The step (D) comprises adding 2-(2- phenoxybenzene)-2-hydroxyimino-acetamide, dimethyl sulfate, and phase transfer catalyst tetrabutyl ammonium bromide and solvent to reaction bulb, reacting for 5-20 hours at 0-40 degrees C, extracting with ethyl acetate, concentrating, and refining and obtaining metominostrobin.