NOVELTY - Continuously aging catalytic cracking catalyst, comprises e.g. adopting catalyst aging device comprising a fluidized bed reactor and a dilute phase combustion tube, conveying the catalyst into dilute phase combustion tube bottom with an oxygen-containing gas, fuel mixing, combusting, carrying out gas-solid separation, conveying the separated catalyst into the lower part of dense phase bed layer of fluidized bed reactor, injecting steam and contacting with the high temperature catalyst in the fluidized bed reactor, carrying out hydro-thermal reaction, and reducing the activity of catalyst.    USE - The aged catalyst is useful in hydrocarbon oil catalytic cracking reaction.    ADVANTAGE - The method and device are capable of separately controlling the combustion reaction and hydro-thermal reaction operating condition, and can uniformly distribute the activity of aged catalyst and improve product distribution.    DETAILED DESCRIPTION - Continuously aging catalytic cracking catalyst, comprises (a) adopting a catalyst aging device comprising a fluidized bed reactor and a dilute phase combustion tube, conveying the catalyst into the dilute phase combustion tube bottom with an oxygen-containing gas, carrying out fuel mixing, combusting, flowing towards upward, after completion of the reaction passing the gas and catalyst through a dilute phase combustion outlet for gas-solid separation, and conveying the separated catalyst into the lower part of the dense phase bed layer of fluidized bed reactor; (b) injecting steam and contacting with the high temperature catalyst in the fluidized bed reactor, carrying out hydro-thermal reaction, reducing the activity of catalyst, carrying out gas-solid separation of catalyst and gas at the top of catalyst aging device, discharging the gas using a gas discharging device, and returning back the separated catalyst to the fluidized bed reactor; (c) setting a catalyst buffer tank at the bottom of the fluidized bed reactor, conveying the catalyst into catalyst buffer tank, and then conveying the catalyst from the catalyst buffer tank into dilute phase combustion tube through a control valve; and (d) reducing the catalyst activity to an appropriate level, discharging most of the aged catalyst at the bottom of the fluidized bed reactor to maintain the catalyst material level, continuously circulating the catalyst in the dilute phase combustion tube and fluidized bed reactor, and continuously aging until adding fresh catalyst. An INDEPENDENT CLAIM is also included for a catalytic cracking catalyst aging device, comprising a fluidized bed reactor and a dilute phase combustion tube, the top of the dilute phase combustion tube provided with a gas-solid separating device, the gas phase outlet of the gas-solid separating device extends into a catalyst aging device, A solid phase outlet is set in the catalyst dense-phase bed layer of fluidized bed reactor, the top of fluidized bed reactor is provided with the gas-solid separating device, the gas phase outlet of the gas and solid separating device on top of the fluidized bed extends into the catalyst aging device, the bottom of the fluidized bed reactor is connected with a catalyst buffer tank, and the catalyst buffer tank is connected with the dilute phase combustion tube through a control valve.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the catalytic cracking catalyst aging device.