The invention discloses a methylene rhodanine reagent and application thereof in solid phase extraction of platinum, belongs to the field of hydrometallurgy, and in particular relates to a new methylene rhodanine reagent and application thereof in solid phase extraction of platinum. The extracting reagent has a structural formula shown as the specifications, and is named 2,4-dimethyl benzol-methylene rhodanine. The reagent is prepared by condensing 2,4-dimethylbenzylidene and rhodanine in a glacial acetic acid medium. A solid phase extraction column prepared from the reagent can be used for the solid phase extraction of platinum, has high selectivity and high enrichment factor, and has high extraction capacity for the platinum, and the material can be repeatedly used. The primary extraction rate for the platinum is over 95.3 percent, and the enrichment factor is more than 500; and the material has the extraction capacity of 28.5mg/g for the platinum.