Method for preparing monolayer graphite

The invention discloses a method for preparing monolayer graphite, the method comprising an oxidation step of oxidizing graphite materials to form graphite oxides; a peeling and prereduction step of putting graphite oxides in vacuum, a protective atmosphere, a reduction atmosphere or a mixture of the protective atmosphere and the reduction atmosphere and contacting a heat source with a temperature higher than 300 DEG C to form graphite oxides having a monolayer nanostructure; a reduction and heat-treatment step of placing the graphite oxides having the monolayer nanostructure in a reduction atmosphere with a heat-treatment temperature and lowering oxygen content of the graphite oxides having the monolayer nanostructure to less than 1wt%; and a mechanical grinding and reduction step of carrying out mechanical grinding to the graphite oxides to achieve sufficient dispersing, using an alkaline solution as a grinding fluid to help conduct reduction to the graphite oxides, and then obtaining the monolayer graphite