The invention discloses a fluid distributor and a fluidized bed reactor. The fluid distributor comprises multiple branch pipes (1), and a pipe cavity of each branch pipe is internally provided with a guide rod (2) and a banded helical blade (3), wherein the guide rod (2) extends along the central axis of the branch pipe (1), the helical blade (3) extends around the guide rod (2) in the axial direction, the inner side edge of the helical blade (3) is connected to the peripheral wall of the guide rod (2), and the outer side edge of the helical blade (3) is attached to the inner wall face of the branch pipe (1). According to the technical scheme, each helical blade arranged in the corresponding branch pipe forms a fluid channel extending in a helical mode, materials or fluids flowing through the fluid channels need to change the speed and direction continually to rotate, the gradient of the speed is generated, particularly, the upper surfaces of the helical blades can support the materials, and the phenomenon that material particles pass through the helical blades and further reach the interior of the fluid distributor can be avoided.