The invention belongs to the field of synthesis of high polymer materials and in particular relates to epoxy terminated polyarylether resins with phthalonitrile side group and curing materials and preparation methods thereof. The preparation method of the epoxy terminated polyarylether resins with phthalonitrile side group is characterized by taking 4-(3,5-dihydroxy phenoxy)-phthalonitrile or derivatives thereof and commercial aromatic di-halogen compounds as polycondensation monomers and simultaneously adding other aromatic bisphenol monomers to carry out nucleophilic substitution reaction and then taking 3-chloro-1,2-epoxypropane as a terminator, thus preparing a series of epoxy terminated polyarylether resins with phthalonitrile side group. The method is simple in steps and convenient and feasible. The polyarylether resins show better dissolubility in the common polar solvents, can be processed in various forms and have good adhesive properties and higher curing reaction activities. The resins are precured at 0-200 DEG C in the presence of aromatic diamines and the like and then are heated to 250-350 DEG C to undergo heat treatment, thus obtaining the resin curing materials with stable dimensions, excellent heat resistance and high strength. The epoxy terminated polyarylether resins with phthalonitrile side group are used in such fields as high-temperature resistant coatings, paints, adhesives, thin films, composites and the like and have extensive application prospect.