The utility model discloses a catalytic cracking reactor with short reaction time, which solves the problem of uniform mixing of raw oil and a regeneration catalyst and secondary cracking of a reaction process in catalytic cracking engineering with the short reaction time in the prior art. The technical scheme is as follows: the catalytic cracking reactor with the short reaction time comprises a first reactor section, a tapered pipe section, a second reactor section and a connection pipe which are arranged sequentially along the same axis; a regeneration catalyst conveying pipe and a nozzle are arranged on the first reactor section; a cyclone separator is connected with the second reactor section by the connection pipe; a turbulent flow member is arranged on the pipe inner wall of the tapered pipe section. With the adoption of the catalytic cracking reactor with the short reaction time disclosed by the utility model, the reaction time of raw materials can be controlled within 0.3s-1.5s, and a secondary reaction of a raw material cracked product is inhibited, so that production distribution and production properties of a catalytic cracking reaction are improved and the energy consumption of the device is reduced.