Skin incision device

The utility model provides a skin cutter which comprises a shell and a cutter assembly movably arranged in the shell, the cutter assembly comprises a cutter, a supporting piece, a first elastic piece, a second elastic piece, a start button and a reset button, and the cutter is installed in the shell through the supporting piece. The first elastic piece is located in the shell and abuts against the end, away from the tool nose, of the cutter, the second elastic piece abuts against the position between the supporting piece and the shell, the start button penetrates through the cutter, one end of the start button is exposed out of the shell, and the start button is operated to enable the first elastic piece to drive the cutter to be exposed out of the shell. The reset button is operated to enable the second spring to drive the cutter to retract into the shell; an elastic balloon is further arranged at the end, away from the tip of the cutter, of the shell, and by operating the elastic balloon, the end, allowing