Preparation method and system of high-selectivity glyoxylic acid

The invention relates to a preparation method and system of high-selectivity glyoxylic acid, and belongs to the technical field of organic synthesis process.The method comprises the steps that an acrylic acid solution and a catalyst are mixed, and a first reaction raw material is obtained; the first reaction raw material and a second reaction raw material are subjected to a continuous oxidation reaction in a reactor, the second reaction raw material comprises hydrogen peroxide, and an intermediate product is obtained; separating the intermediate product to obtain acrylic acid and glyoxylic acid; recycling acrylic acid and mixing with the catalyst; a continuous oxidation and separation matching mode is adopted, unreacted acrylic acid is separated from oxalic acid and then is subjected to continuous oxidation reaction again, acrylic acid can be deoxidized with a small amount of oxidizing agent hydrogen peroxide, and the primary conversion rate of raw materials is reduced; the selectivity and yield of the produc