The invention relates to a riser reactor. An anti-slide internal component is arranged on the inner wall of the riser of the reactor. The anti-slide internal component comprises ribs along the circumference of the inner wall of the riser, and at least one of the ribs is arranged in the height direction of the riser. Through the structural design, the riser reactor can prevent solid particles from sliding along the edge and the wall, and prevent the concentration of solid particles on the section of the riser from being too low in the middle, and the concentration of solid particles on the section of the riser from being too high near the edge and the wall when being used in reaction; flat flow is achieved in the riser so that the concentration of the solid particles tends to be consistent with the dwell time, which facilitates reaction inside the riser reactor.