The invention provides a cesium neopentanoate co-catalyzed aryl borate preparation method, which comprises: dissolving a compound represented by a formula (I) and a diboron compound in an organic solvent, adding an organic solvent in which cesium neopentanoate, palladium acetate and triphenylphosphine are dissolved, and carrying out a reaction to obtain aryl borate, in the formula (I), R1, R2, R3, R4 and R5 being independently selected from H, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C1-C10 alkoxy, hydroxyl, hydroxyl-substituted C1-C10 alkyl, phenyl and C1-C10 alkylamino respectively; x being selected from F, Cl, Br and I. The preparation method is low in production cost, high in product yield and purity, easy to operate and suitable for industrial mass production.