The invention provides a folding intraventricular axial flow blood pump which comprises a motor and a folding blood pump. The folding blood pump comprises a folding impeller, a folding pump shell and an exit guide vane; the folding impeller comprises an impeller shaft and a folding vane which is arranged on the impeller shaft and can be folded; the folding pump shell is of a folding spiral cage-shaped structure and is provided with a blood pump inlet and a blood pump outlet; one end, which is provided with the blood pump inlet, of the folding pump shell is connected with a housing of the motor; both the folding impeller and the exit guide vane are positioned inside the folding pump shell and are fixedly connected with a shaft of the motor; the exit guide vane is positioned at the position of the blood pump outlet. In the implantation process, the folding impeller and the folding pump shell can be folded, so that the volume in the implantation process is reduced, the minimally-invasive implantation of the large-volume blood pump is implemented and under the same working condition, the rotating speed of the blood pump is reduced and blood compatibility of the blood pump is improved.