The invention relates to a novel gypsum plaster, which comprises uncalcined gypsums, air hardening keene's cement and/or hydraulic cementing materials, as well as functional additives, wherein the dosages of the materials are as follows: 50 to 60 percent of the uncalcined gypsums, 40 to 50 percent of the air hardening keene's cement and/or the hydraulic cementing materials, and 0 to 0.3 percent of the functional additives. The novel gypsum plaster uses cheap chemical gypsum as a main raw material which is matched with keene's cement or the hydraulic cementing materials, thus certain amount ofa hydration product dihydrate gypsum exists at the beginning of hydration, and the latter hydration products are cemented together with the dihydrate gypsum to form a new hardened body. Therefore, the gypsum as a main body and the advantages thereof are preserved, and the contradictions in the hydrating and hardening processes are solved.