Preparation method of amide

The invention discloses a preparation method of amide. The amide contains a structure shown in the specification. The method comprises the following step: carrying out one-step reaction by adopting a corresponding amide type compound as a starting reactant, a reducing agent and a corresponding acid to prepare a final amide product. According to the preparation method disclosed by the invention, the reaction steps are reduced, the cost can be effectively reduced, and the process flow is simplified.