▎ 摘　　要

NOVELTY - The device has a screen arranged in a shell (100). A microbubble generator (300) is connected to a bottom of the shell to introduce microbubbles into the shell. The dispersion liquid containing different size micro-nano particles is placed in the shell. The micro-nano particles are driven by the micro-bubbles to pass through the screen to classify the size of the micro-nano particles. Multiple screen meshes are arranged in the shell in an increasing order in sequence from bottom to top according to the mesh number of the screen. The micro-nano particle is selected from graphene, oxidized graphene and silicon dioxide. The screen meshes are provided with first screen (201) and a second screen (202). USE - Micro-nano particle e.g. oxidized graphene, size grading device. ADVANTAGE - The micro-nano particle size grading device has low cost, simple maintenance, large grading range, accurate grading, short grading time and high efficiency, and has good industrial application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for grading micro-nano particle size by using the device. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a micro-nano particle size grading device. Shell (100) First screen (201) Second screen (202) Micro-bubble generator (300)