The invention provides a hair jointing device, and belongs to the technical field of hairdressing and beauty tools. The hair jointing device solves the problems that in the prior art, hair jointing cannot be conducted conveniently and efficiently. The hair jointing device comprises a shell with a cavity. An opening is formed in one end of the shell, a handle is fixed to the other end of the shell, an installing piece is fixed to the end of the shell and detachably provided with a positioning bar for positioning real hair, the side face, facing the opening, of the positioning bar is provided with multiple positioning grooves, heating blocks are arranged in the shell, the end faces, facing the positioning bar, of the heating blocks are provided with multiple protrusions matched with the positioning grooves, and the other ends of the heating blocks are connected with a driving mechanism capable of driving the heating blocks to stretch out of the opening to enter the positioning grooves or retract into the shell. The real hair and fake hair can be more quickly, more conveniently and more efficiently fused together in a time-saving mode, so that the real hair and the fake hair can be quickly jointed.