A device for preparing a catalytic cracking catalyst. The device contains a tubular reactor, a gas mixer, a raw material mixing unit, an absorbing tower, a beater and a nodulizer. The tubular reactor contains at least one feed inlet, a discharge hatch and a pipe body. One of the feed inlets and the discharge hatch are respectively positioned on two end portions of the pipe body. The tubular reactor communicates with the raw material mixing unit through one of the feed inlets and communicates with a gas-solid separator through the discharge hatch. The top and bottom of the gas-solid separator respectively communicate with the absorbing tower and the beater. The position where the gas-solid separator is connected with the discharge hatch is lower than the position where the gas-solid separator is connected with the absorbing tower. The nodulizer collects materials from the beater. By the adoption of the device provided by the invention, continuous contact reaction between a molecular sieve and SiCl4 can be realized. By controlling flow velocity of a gaseous mixture and the length of the tubular reactor, the contact time of the molecular sieve and SiCl4 can be controlled, therefore fully carrying out the reaction.