A battery cell manufacturing device configured to manufacture a battery cell comprising two or more unit cells, each of the unit cells having a structure in which two or more electrode plates are stacked in a state in which a separator is disposed between the electrode plates, and wherein the battery cell is a secondary battery, the battery cell manufacturing device comprising: a unit cell stacking unit into which unit cells are introduced from above and in which the unit cells are sequentially stacked, wherein the unit cell stacking unit comprises a hopper type upper part, an upper end of which is open and a diameter of which is decreased in a downward direction, and a lower part having an interior size corresponding to the unit cell stack; a wrapping unit to wrap an outside of a unit cell stack discharged from the unit cell stacking unit with a separation film, wherein the wrapping unit comprises: a jig to wrap a top or bottom of the unit cell stack with the separation film; a wrapping plate to continuously wrap the bottom or top of the unit cell stack with the separation film in a state in which the top or bottom of the unit cell stack is wrapped with the separation film by the jig; and a sealing block to thermally weld an overlapped portion of the separation film in a state in which the top and bottom of the unit cell stack are wrapped with the separation film; and a heating unit to thermally shrink the separation film wrapping the outside of the unit cell stack, wherein the heating unit is a high temperature chamber; and wherein the lower part of the unit cell stacking unit is provided with a lower discharge port, through which the unit cell stack is sequentially discharged, the lower part of the unit cell stacking unit has an inner diameter larger than electrode plates of each of the unit cells and smaller than a separator of each of the unit cells, and the lower part of the unit cell stacking unit is provided with a step protrusion to support a separator of each of the unit cells. a unit cell stacking unit into which unit cells are introduced from above and in which the unit cells are sequentially stacked, wherein the unit cell stacking unit comprises a hopper type upper part, an upper end of which is open and a diameter of which is decreased in a downward direction, and a lower part having an interior size corresponding to the unit cell stack; a wrapping unit to wrap an outside of a unit cell stack discharged from the unit cell stacking unit with a separation film, wherein the wrapping unit comprises: a jig to wrap a top or bottom of the unit cell stack with the separation film; a wrapping plate to continuously wrap the bottom or top of the unit cell stack with the separation film in a state in which the top or bottom of the unit cell stack is wrapped with the separation film by the jig; and a sealing block to thermally weld an overlapped portion of the separation film in a state in which the top and bottom of the unit cell stack are wrapped with the separation film; and a jig to wrap a top or bottom of the unit cell stack with the separation film; a wrapping plate to continuously wrap the bottom or top of the unit cell stack with the separation film in a state in which the top or bottom of the unit cell stack is wrapped with the separation film by the jig; and a sealing block to thermally weld an overlapped portion of the separation film in a state in which the top and bottom of the unit cell stack are wrapped with the separation film; and a heating unit to thermally shrink the separation film wrapping the outside of the unit cell stack, wherein the heating unit is a high temperature chamber; and wherein the lower part of the unit cell stacking unit is provided with a lower discharge port, through which the unit cell stack is sequentially discharged, the lower part of the unit cell stacking unit has an inner diameter larger than electrode plates of each of the unit cells and smaller than a separator of each of the unit cells, and the lower part of the unit cell stacking unit is provided with a step protrusion to support a separator of each of the unit cells.