The utility model relates to a cutting device for vegetables and fruits, which comprises a shell body, a pressing cover, a position converting mechanism, a blade group, and a material cutting group, wherein, the position converting mechanism comprises a sliding cylinder, a guide sliding sleeve, and a ratchet wheel ring, wherein, a circumference external ring of the lower part of the sliding cylinder is provided with small tooth blocks; the circumference of the lower part of the guide sliding sleeve is provided with cogs; the lower part of the ratchet wheel ring is provided with ratchet teeth which is positioned at the lower part of the cogs of the guide sliding sleeve; the ratchet teeth and the cogs of the guide sliding sleeve are positioned in a transplacement mode. Because the utility model adopts a structure that the cogs of the guide sliding sleeve and the ratchet teeth of the ratchet wheel are positioned in a transplacement mode which are respectively engaged with the small tooth blocks of the sliding cylinder, the blade group can uniformly rotate by a certain angle in the course of each upper and lower motion.