The utility model discloses a fluidized catalytic cracking lift pipe reactor for petroleum processing. The utility model solves the problems that when the height of the pre-lifting segment of the existing lift pipe reactor is high, the utility model has difficult catalyst bed fluidization, great pressure fluctuation, unsteady regeneration sloped pipe baiting, etc. The lower part of the lift pipe reactor is provided with a pre-lifting segment (8) with the expanding diameter structure, and the sidewall of the pre-lifting segment (8) is communicated with a regenerating sloped pipe (2). An inner lift pipe (11) is arranged in the pre-lifting segment, and the lower part of a bell mouth-shaped inlet (111) at the bottom of the inner lift pipe (11) is provided with a pre-lifting gas pipe (5) and a one-segment fluidizing gas distributor (7). A two-segment fluidizing gas distributor (10) is arranged around the outer wall of the inner lift pipe at the upper part of the one-segment fluidizing gas distributor, and the two-segment fluidizing gas distributor is positioned at the upper part of the inlet of the regenerating sloped pipe. The fluidized catalytic cracking lift pipe reactor has suitable height of the pre-lifting segment at 5 to 15 M.