The invention relates to organic synthesis, in particular to a preparation method for converting an organic carboxylic acid to an organic aldehyde. The method comprises the steps that : two reactions are carried out in a reaction container to convert a carboxyl in a carboxylic acid to a boroxyl compound first and then to oxidize the boroxyl compound to an aldehyde by an acetone solution of a trichloroisocyanuric acid with a mass 1.0 to 1.2 times that of the reaction substrate of carboxylic acid at a temperature of between 0 and 40 DEG C in the presence of 0.1 to 1.0 percent of 2, 2, 6, 6-tetramethylpiperidine-1-oxyl against the mass of the reaction substrate of carboxylic acid and a base with a mass 1.0 to 1.2 times that of the reaction substrate of carboxylic acid. The method for preparing the aldehyde from the organic carboxylic acid by one-pot reaction of the invention has the advantages of moderate reaction conditions, rapid reaction, green reaction due to use of nontoxic oxidizer, simple process, easy operation, easy handling, and contribution to the realization of industrialization.
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