The utility model discloses a dynamic negative pressure axial starting device, relating to the technical field of dynamic negative pressure perforating process equipment. A fixed ring and a connecting disc are respectively and fixedly connected with both ends of a conductor, a detonating cord penetrates through the conductor, the fixed ring and the connecting disc, and both ends of the detonating card are connected with a detonating primer; and the conductor is positioned in a valve body, both ends of the valve body are respectively connected with a drift-diameter mother joint and a common joint, the detonating cord extends to the drift-diameter mother joint and the common joint, and the other end of the drift-diameter mother joint is connected with an axial starting explosive device. The starting device is controlled to turn on by the action of an explosive device and then form a dynamic negative pressure to clean perforating ducts when perforating so that the flow conductivity is improved; and the dynamic negative pressure axial starting device rapidly and timely manufactures the dynamic negative pressure without damaging a sleeve pipe and resulting in junks and has simple manufacturing process, and the valve body can bear different classes and types of pressures.