The invention belongs to the technical field of compound preparation and particularly relates to a preparation method of organic body hydyne. Hydyne is an important organic midbody. In the invention, hollow zeolite micro-capsule packaged with precious metal Pt (marked as Pt@S1) is taken as a catalyst, and under air atmosphere, the hydyne is directly synthesized by alcohol. In the invention, two inevitable processes of alcohol oxidation for forming ketone and then condensation with hydrazine are combined into one step of synthesizing hydyne by alcohol directly. In the method, not only reaction material can be more effectively used, but also the reaction efficiency is improved, and further, a series of consumption caused by steps such as product separation, purification, product shift and the like during stepped reaction process can be reduced. The zeolite micro-capsule catalyst used in practical has excellent recyclability and long service life. In addition, since the catalyst has the characteristics of adjustable catalytic active site number (the content of Pt), adjustable casing layer thickness, convenience in separation, stability and the like, the method is enabled to be better in practicability and effectiveness.