A convex grind method for grinding a knife includes preparing a grinding tool, first angle grinding, second angle grinding, third angle grinding and polishing. The grinding tool includes an actuator, a grinding member detachably mounted on the actuator, and two guide blocks disposed at two opposite sides of the grinding member. The grinding member has two conical grinding faces, and each of the two guide blocks is formed with a guide face disposed at a vertical state and located above each of the two conic grinding faces of the grinding member. The grinding tool performs the first angle grinding, the second angle grinding and the third angle grinding to abrade the blade of a knife. Then, the blade of the knife is polished to finish the grinding process so as to form a convex grind knife.
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