A delivery device configured to deliver a main stent having a fenestration, characterized in that, the delivery device comprises: a core assembly; an outer sheath, which is hollow and mounted around an outer periphery of the core assembly, with a delivering gap defined between the outer sheath and the core assembly, wherein the delivering gap has a distal end for receiving a folded main stent; and a pre-embedded guidewire, entering the delivering gap through the proximal end of the delivering gap and extending to the distal end of delivering gap passage, the pre-embedded guidewire having a distal end configured to enter into the main stent from an outside of the main stent via the fenestration, and the pre-embedded guidewire being configured to guide a branch guidewire to pass through the main stent from an inside to the outside of the main stent via the fenestration of the main stent, wherein the delivery device further comprises a control handle connected with the outer sheath, and wherein the control handle controls the outer sheath to move axially relative to the core assembly so as to enable the folded main stent to be in a partly released state or in a completely released state, and a sheath joint is secured to an outer periphery of the outer sheath, and the control handle comprises: a support body, with the sheath joint provided therein, wherein when being subjected to an axial force, the sheath joint moves axially within the support body to drive the outer sheath to move axially; a fixed handle, mounted outside a distal end of the support body and secured thereto; and a sliding handle, mounted outside a distal end of the support body adjacent to a proximal end of the fixed handle, the sliding handle being rotatable at the outside of the support body so as to drive the sheath joint to move axially, and the sliding handle is axially slidable on the support body, an unlocking button is embedded in the fixed handle, the unlocking button is provided with a hook extending from one side of the unlocking button, and the hook hooks the sliding handle in such a way that the sliding handle is arranged next to the fixed handle and prevented from axially sliding. a core assembly; an outer sheath, which is hollow and mounted around an outer periphery of the core assembly, with a delivering gap defined between the outer sheath and the core assembly, wherein the delivering gap has a distal end for receiving a folded main stent; and a pre-embedded guidewire, entering the delivering gap through the proximal end of the delivering gap and extending to the distal end of delivering gap passage, the pre-embedded guidewire having a distal end configured to enter into the main stent from an outside of the main stent via the fenestration, and the pre-embedded guidewire being configured to guide a branch guidewire to pass through the main stent from an inside to the outside of the main stent via the fenestration of the main stent, wherein the delivery device further comprises a control handle connected with the outer sheath, and wherein the control handle controls the outer sheath to move axially relative to the core assembly so as to enable the folded main stent to be in a partly released state or in a completely released state, and a sheath joint is secured to an outer periphery of the outer sheath, and the control handle comprises: a support body, with the sheath joint provided therein, wherein when being subjected to an axial force, the sheath joint moves axially within the support body to drive the outer sheath to move axially; a fixed handle, mounted outside a distal end of the support body and secured thereto; and a sliding handle, mounted outside a distal end of the support body adjacent to a proximal end of the fixed handle, the sliding handle being rotatable at the outside of the support body so as to drive the sheath joint to move axially, and the sliding handle is axially slidable on the support body, an unlocking button is embedded in the fixed handle, the unlocking button is provided with a hook extending from one side of the unlocking button, and the hook hooks the sliding handle in such a way that the sliding handle is arranged next to the fixed handle and prevented from axially sliding. a support body, with the sheath joint provided therein, wherein when being subjected to an axial force, the sheath joint moves axially within the support body to drive the outer sheath to move axially; a fixed handle, mounted outside a distal end of the support body and secured thereto; and a sliding handle, mounted outside a distal end of the support body adjacent to a proximal end of the fixed handle, the sliding handle being rotatable at the outside of the support body so as to drive the sheath joint to move axially, and the sliding handle is axially slidable on the support body, an unlocking button is embedded in the fixed handle, the unlocking button is provided with a hook extending from one side of the unlocking button, and the hook hooks the sliding handle in such a way that the sliding handle is arranged next to the fixed handle and prevented from axially sliding.