ACMO-co-DVB-co-NVP@MCM-41 material was obtained by polymerizing divinylbenzene （DVB）， N-vinylpyrrolidone （NVP） and 4-acryloylmorpholine （ACMO） on MCM-41 mesoporous microspheres to meet the requirements of detecting polar pesticides in cowpea. The material was characterized with scanning electron microscope， Fourier transform infrared spectrometer， thermogravimetric analyzer and N2 adsorption-desorption. Solid-phase microextraction （SPME） fibers were prepared from this material. A method for determining methomyl， carbofuranandcyromazine in cowpea was established by direct immersion-SPME combined with gas chromatography-nitrogen phosphorus detector. Under the optimized extraction conditions， the linear relationship of the three pesticides was good， the coefficients of determination were all greater than 0.99， with the detection limits of 1.71-18.79 μg/kg and the quantification limits of 5.71-62.63 μg/kg. The recoveries of 3 pesticides ranged from 84.4% to 116.1%， and the relative standard deviations ranged from 2.2%-7.5%. It is indicated that the method established has good sensitivity， accuracy and reliability， and can satisfy the maximum residue limit （MRL） of pesticide in cowpea. Compared with the popular coating made from hydrophilic-lipophilic balance particles， it has a large extraction capacity and a stronger extraction performance for strong polar substances， which will have a good application prospect in the extraction of non-targeted analytes.