Isobutyric acid hydrazide preparing method

The invention relates to the field of isobutyric acid hydrazide and discloses an isobutyric acid hydrazide preparing method. The method comprises the steps of 1, making isobutyric acid and methyl alcohol react in the presence of a catalyst under the esterification reaction condition, distilling a mixture obtained from esterification reaction at 70-120 DEG C to obtain distillate containing methyl isobutyrate and residual liquid, and removing aqueous phase in the distillate through separation to obtain an organic phase containing methyl isobutyrate; 2, making the organic phase containing methyl isobutyrate obtained from step 1 react with hydrazine hydrate under the condition of hydrazinolysis. In step 1, the molar ratio of isobutyric acid to methyl alcohol is 1:(1-2.8). By the adoption of the method, the yield and purity of the product isobutyric acid hydrazide are high.