The invention discloses a cell culture bed for a bioreactor in the field of medical equipment. The cell culture bed is arranged in a tank body and comprises a guide barrel, a porous round pipe and a multistage speed adjustment stirrer, wherein the porous round pipe is concentrically connected with the guide barrel at the bottom of the guide barrel; the multistage speed adjustment stirrer is inserted into the porous round pipe from the bottom of the porous round pipe; an upper fixing plate around the circumference of the guide barrel is arranged at the top of the guide barrel; a lower fixing plate around the circumference of the porous round pipe is arranged at the bottom of the porous round pipe; the upper fixing plate and the lower fixing plate are both porous plates; filler comprising cell culture carriers is filled between the bottom surface of the upper fixing plate and the top surface of the lower fixing plate; and the height of the filler is maximally 2/3 of the distance between the bottom surface of the upper fixing plate and the top surface of the lower fixing plate. The cell culture bed has the technical effects that cells and cell culture carriers are not easily rushed out when the cell culture bed is used for cell culture, and the cell growth speed is uniform.