Method for preparing aromatic hydrocarbon mixture rich in benzene, methylbenzene and xylene from methanol through light olefin

A method for preparing an aromatic hydrocarbon mixture rich in benzene, methylbenzene and xylene from methanol through light olefin adopts two sections of fixed bed reactors. A reaction material inlet is formed in the top of a first reactor, at least two material inlets corresponding to catalyst bed layers in the reactor are formed in the side wall, a reaction material outlet is formed in the bottom, at least three catalyst bed layers are arranged in the first reactor, steam coil pipes are arranged among the catalyst layers, the reaction material inlets are located above the catalyst bed layers and are in one-to-one correspondence to the fixed bed reactors; and a second reactor is filled with a light olefin aromatization catalyst, and a methanol to olefin reaction and a light olefin aromatization reaction are combined. The method has the advantages of simple process and low cost.