The invention discloses a non-toxic and environmentally-friendly fluorgypsum modifying method and a process for preparing cement, plaster powder and ornament plaster tablets from the fluorgypsum based on the method. The fluorgypsum modifying method comprises the following steps of: 1) cooling the fluorgypsum released from hydrofluoric acid production in a sealed environment, washing gas in the sealed environment with water in a cooling process and absorbing released hydrogen fluoride (HF) gas; 2) adding a neutralizer into the fluorgypsum processed by step 1) until the pH value is 7 to 8, wherein the neutralizer is lime water; 3) adding an excitant in an amount of 0.5 to 1.1 percent based on the weight of the fluorgypsum into the fluorgypsum which is neutralized by step 2) and uniformly mixing the materials, wherein the excitant may be one or several of sodium sulfate, aluminum sulfate and sulphate aluminium salts; 4) drying the fluorgypsum obtained by step 3) in the shadow for 12 hours and then smashing the fluorgypsum dried in the shadow; and 5) moisturizing and maintaining the fluorgypsum smashed by step 4) for 14 days to obtain the product.