The invention discloses a support body applied to an advertisement support. The support body comprises a top connecting plate, wherein two ends of the top connecting plate are separately assembled andfixed with the top ends of vertical supporting plates; the bottoms of the vertical supporting plate are assembled and fixed with second shaft bodies on a base through clamping rings; a sliding chuteand a locking mounting groove are formed in each vertical supporting plate; a first splined hole is formed in the bottom of each vertical mounting plate; a lifting plate is arranged in each sliding chute; a locking groove is formed in each lifting plate; each lifting plate is clamped and fixed by the corresponding locking groove and locking assemblies; a buckling plate and a first fixed plate arealso arranged on each vertical supporting plate; a buckling groove is formed between each buckling plate and the corresponding vertical supporting plate and is separately clamped and assembled with afirst transverse supporting plate and a second transverse supporting plate; the bottom of the first transverse supporting plate and the bottom of the second transverse supporting plate are respectively hinged to the vertical supporting plates by hinge pins; each vertical supporting plate is assembled with the corresponding clamping ring through the corresponding first splined hole in the bottom ofthe vertical supporting plate; each clamping ring is assembled with the corresponding second shaft body on the base. The invention also discloses the advertisement support applying the support body.The height and the width of the support body disclosed by the invention can be adjusted, so that the support body adapts to display panels with different sizes.