The invention discloses a dicing device. The dicing device comprises a head provided with a feed channel and a dicing unit connected to the head. A collection barrel is arranged below the dicing unit. The dicing unit comprises a dicing plate connected to the head. The dicing plate comprises a dicing board. A dicing blocking ring extending upwards is arranged on the outside of the dicing board. The dicing board is provided with a dicing through hole. A lattice knife rest is arranged in the dicing through hole. A rotary knife capable of cutting fruit and vegetable and pushing the cut fruit and vegetable into the lattice knife rest is arranged in the dicing plate. The upper end of the dicing blocking ring is provided with a blocking plate extending to the inside and capable of preventing the outer end of the rotary knife from tilting upwards. The blocking plate is provided with a vertical opening in which the rotary knife is arranged. A driving mechanism driving the rotary knife is arranged in the head. The dicing device is simple in structure, easy to operate and low in cost.