The utility model discloses a rotary type vegetable-cutter comprising an upper sleeve and a lower sleeve, which are detachable. A circular groove is disposed in the inner wall of the upper sleeve, and a middle positioning disc is clamped in the circular groove through the rolling ball positioning device. A handle used for the hand-held operation is disposed on the upper surface of an upper positioning disc, and a snake-shaped groove is disposed in the lower surface of the upper positioning disc. A curved surface cutting knife with the same size as the snake-shaped groove is disposed in the snake-shaped groove, and two sides of the top end of the curved surface cutting knife is fixed on the upper positioning disc through a positioning clamping slot. A snake-shaped groove having the same size as the curved surface cutting knife is disposed in the middle positioning disc, and the other end of the curved surface cutting knife passes through the snake-shaped groove in the middle positioning disc and then extends into the lower sleeve. The utility model has advantages of reliable structure, easy disassembly and cleaning, ability of showing people the whole process of vegetable cutting and enabling the knife to rotate at the unspecified angle to cut the vegetables anywhere.