NOVELTY - A petroleum hydrocarbon catalytic conversion method involves reacting raw oil with catalyst containing mesoporous zeolite. Cracking reaction is carried out. The catalyst separated from the reacted oil is regenerated and returned to a reactor. The reaction oil and gas are separated to obtain product containing ethene, propylene, butane and catalytic gasoline containing aromatic hydrocarbon. The catalytic gasoline is selectively hydrogenated to obtain target product of light aromatic hydrocarbon. Steam cracking with propylene and butane is carried out to produce ethane and propylene.    USE - Method for catalytic conversion of petroleum hydrocarbon.    ADVANTAGE - The method enables increasing yield of ethane and propylene to 20.31 percent by weight and 31.67 percent by weight, respectively and increasing biotime dividend yield to 24.39 percent by weight.    DETAILED DESCRIPTION - A petroleum hydrocarbon catalytic conversion method involves contacting and reacting raw oil with catalyst containing mesoporous zeolite in a reactor, where reaction temperature is 500-750 degrees C, weight hourly space velocity is 100-800 h-1 and pressure is 0.10-1.0 MPa, and weight ratio of the catalyst to the raw oil is 1:100. Cracking reaction is carried out at weight ratio of steam to raw oil of 0.05-1.0. The catalyst to be generated is separated from the reacted oil and gas. The catalyst to be generated is regenerated and returned to the reactor. The reaction oil and gas are separated to obtain product containing ethene, propylene, butane and catalytic gasoline containing aromatic hydrocarbon, where the catalytic gasoline is selectively hydrogenated and sent into an aromatic hydrocarbon extracting device to obtain target product of light aromatic hydrocarbon. The rest oil is extracted, and steam cracking with propylene and butane is carried out to produce ethane and propylene.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic illustration of a method for catalytic conversion of petroleum hydrocarbon.