The invention relates to a concrete permeability nondestructive detection method. The method comprises the following steps: S1, in a preparation stage, an image or brightness of a standard concrete water absorption process is recorded, and a comparison template is determined; S2, a water spraying area on the surface of the concrete is divided, a detection area is defined, the detection area is cleaned, and impurities such as dust on the surface of the concrete are reduced; S3, the water content of the concrete is detected; S4, water is sprayed to the detection area; S5, a concrete surface water absorption process is recorded, and an index value representing water absorption is calculated according to the record; and S6, permeability calculation is carried out, an index value representing water absorption is calculated according to the record of the water absorption process of the surface of the concrete, and the impermeability of the concrete is further obtained. The concrete permeability nondestructive detection method has the effects that in the concrete permeability detection process, the initial water content in the concrete is consistent with the initial water content of the compared standard concrete, the comparison error is reduced, the concrete surface permeability detection precision is improved, and the detection error is reduced.