Bentonite was organically modified with hexadecyl trimethyl ammonium Bromide（HDTMA-Br） by using microwave irradiation technique, high oil-absorption resins were synthesized with butyl acrylate (BA) and butyl methacrylate (BMA) as monomers. The effects of amount of dispersant, initiator, crosslinking agent and microwave power reaction time on oil absorption capacity of resins were studied. Chemical groups of the organic bentonite, thermal stability and morphologies of the resins were characterized respectively by using fourier transform infrared (FT-IR) , scanning electron microscopy (SEM) and thermogravimetric analyzer（TGA）. In comparison with the traditional synthesis technique, microwave irradiation method can greatly shorten synthesis reaction time and decrease energy cost, organic bentonite can improve thermal stability of resin. The absorption of the resins to CHCl3 and gasoline could be 35g/g and 16g/g respectively.