The invention belongs to the technical field of sand blasting equipment, and particularly relates to automatic sheet sand blasting equipment. The automatic sheet sand blasting equipment comprises a bottom plate, vertical plates, a top plate, a first sealing baffle, a second sealing baffle, adjusting supporting legs, supporting pipes, spray heads, a conveying pipe, a supplied material recycling boxand an elastic supporting mechanism. According to the automatic sheet sand blasting equipment, the spray heads are arranged on the paired supporting pipes in pairs, so that abrasive materials sprayedout of the spray heads on the two sides of a sheet make contact with the two side surfaces of the same area of the sheet, the force borne by the two sides of the sheet is opposite, the force borne bythe two sides of the sheet is mutually offset, the sheet is suspended between the spray heads arranged in pairs, the sheet is prevented from deforming due to single-side stress, the sheet is prevented from bending and deforming when the surface of the sheet is treated, and the surface treatment quality of the sheet is improved; and an elastic supporting mechanisms are symmetrically arranged, theelastic supporting mechanisms support the sheet discharged from a feeding port of the sand blasting equipment, and then the stability of the sheet at the feeding port of a sand blasting mechanism is improved.