The present invention discloses a modification method for an ordered mesoporous organosilicon material. The method comprises that: a cyclic oligomer and a coupling agent are subjected to a first contact reaction, and then the product obtained after the reaction and an ordered mesoporous organosilicon material are subjected to a second contact reaction, wherein the cyclic oligomer has hydroxyl, the general formula of the coupling agent is O=C=N-R1-Si-(OR2)3, R1 is C1-C10 alkylidene, and R2 is C1-C10 alkyl. The modified ordered mesoporous organosilicon material prepared according to the method has the excellent absorption performance.