The invention discloses a novel autoclaved fly ash self-insulation wall material and a production process. The wall material is produced by adding water into raw materials, mixing, pouring, forming gas, standing, hardening, cutting and autoclaved curing. The wall material is characterized by comprising the following raw materials in percentage by weight: 7 to 10 percent of cement, 15 to 25 percent of lime, 2 to 4 percent of gypsum, 45 to 55 percent of fly ash, 8 to 25 percent of lightweight silicon dioxide micro powder, 0.1 to 0.25 percent of gas forming agent, 0.1 to 0.4 percent of foam stabilizer and 0.8 to 1.5 percent of admixture; the pouring temperature is between 30 and 45 DEG C, and the water temperature is controlled to be between 34 and 50 DEG C; and during steam curing, steam is injected to perform curing for 10 to 15 hours, the temperature in a kettle is kept between 160 and 180 DEG C, and the pressure in the kettle reaches 0.8 to 1.4MPa. The heat conductivity factor of the wall material can reach below 0.9W/(mk), and the compressive strength of the wall material is remarkably improved compared with a B04-grade building block. The wall material can well utilize the fly ash, utilize wastes, save energy, be in accordance with national energy-saving policy and meet national standard for 65 percent energy efficiency, and is an ideal novel energy-saving wall material.