The invention relates to a 3-hydracrylic-acid-producing recombinant Corynebacterium glutamicum strain, and a construction method and application thereof. The construction method of the recombinant Corynebacterium glutamicum strain comprises the following steps: in a Corynebacterium glutamicum strain, overexpressing an endogenous dihydroxyacetone phosphate phosphatase gene hdpA, and overexpressing a glyceroldehydrogenase gene gldA, a glycerol anhydrase and activating factor gene pduCDEGH and a 3-hydroxypropylaldehyde dehydrogenase gene aldH. When the recombinant strain is used for producing 3-hydracrylic acid by fermentation, the Corynebacterium glutamicum strain can perform fermentation by using different cheap raw materials, thereby further lowering the raw material cost. The 3-hydracrylic-acid-producing recombinant Corynebacterium glutamicum strain solves the problems of biosafety and acid tolerance. The strain in the fermentation process can be used in a feed additive as a product. The method can generate fewer byproducts, so that the separation process of the end product 3-hydracrylic acid is simplified.