The invention relates to a slicing device of fruit and vegetable foods. The slicing device of the fruit and vegetable foods comprises a frame, the frame is of a cuboid shape, a material guiding grooveused for placing fruit and vegetable raw materials is internally formed in the upper part of the frame, the front part and the rear part of the material guiding groove communicate with each other, the top of the material guiding groove is opened, a lifting type cutter mechanism located over the front end opening of the material guiding groove is arranged on the front side of the top of the frame,a base plate is internally arranged on the bottom of the frame, the base plate is provided with a power driving mechanism, the power driving mechanism is connected with the lifting type cutter mechanism through a power transmission mechanism, a slice-thickness adjusting mechanism arranged on the front side of the lifting type cutter mechanism is arranged on the top of the frame, and a magnetic adsorption mechanism used for driving the fruit and vegetable raw materials to move forwards along the material guiding groove and arranged on the rear side of the lifting type cutter mechanism is arranged on the top of the frame. According to the slicing device of the fruit and vegetable foods and a slicing method of the slicing device, design is novel, the structure is simple, manual work is onlyneeded to put in the fruit and vegetable raw materials, the labor intensity is greatly lowered, the slicing efficiency is high, the thicknesses of slices are coincident, and the thicknesses of the slices are conveniently adjusted.