The invention relates to a method for preparing aromatic hydrocarbons from methanol and liquefied gas. The method comprises the following steps: 1, filling a fixed bed reactor with a metal cadmium modified ZSM-5 molecular sieve catalyst, wherein the metal cadmium accounts for 0.01-5% of the total weight of the ZSM-5 molecular sieve catalyst; 2, processing the ZSM-5 molecular sieve catalyst in the presence of an inert gas; and 3, adjusting the temperature to a reaction temperature and the pressure to a reaction pressure, inputting methanol and liquefied gas to a preheating mixer at the top end of the reactor, carrying out gasification and mixing, adding the obtained mixture to a reactor, and carrying out a reaction to generate the above product. The methanol conversion rate is 99.9%, and the selectivity of aromatic hydrocarbons in the liquid phase product is 80-92%. The method for preparing aromatic hydrocarbons from methanol and liquefied gas has the advantages of effective improvement of the economic added values of methanol and liquefied gas, low raw material cost and simple preparation process.