Provided is a twisting device of a hair pin-type stator coil. The twisting device of a hair pin-type stator coil, which is to twist-form a plurality of hair pin-type stator coils inserted as a plurality of layers in a stator core, includes i) a base frame, ii) a coil fixing unit installed on the base frame through a plurality of support rods, iii) a twisting tool unit allowing a plurality of stator coils of two adjacent layers, among the plurality of layers, to be inserted thereinto, the two layers being rotated in different directions, and installed to be movable up and down in the base frame on a lower side of the coil fixing unit, iv) a tool driving unit installed on the base frame and operatively connected to the twisting tool unit.