The invention belongs to the field of ore-forming potentiality evaluation of a sandstone type uranium ore in a basin and an exploration technical method and particularly discloses a method for quantitatively evaluating mineralization contribution degree of a uranium resource body for the sandstone type uranium ore. The method comprises following steps: 1, selecting maps or drawings and outlining the uranium resource body; 2, optimizing evaluation parameters; 3, judging the palaeoclimate environment after the uranium resource body is exposed out of an earth surface; 4, calculating respective evaluation parameter weights of the uranium resource body; 5, calculating the contribute degree P (a) of the uranium resource body for an exploration target layer. The method can quantify the evaluation index of the contribute degree of a uranium resource, realizes the qualitative description for the uranium resource body and the single parameter evaluation to the multi-parameter quantitative evaluation, a target region is zoomed out for exploration in a sandstone type uranium ore new zone and the uranium ore exploration efficiency is improved.