Autoclave for AAC Plant has working pressure up to 16 Kg/ cm2 and has working temperature up to 200 ° C. The Autoclave can be availed in a wide range such as automation through PLC, vacuum control, temperature control, process hold and temperature/ pressure holding time, condensate remover system, safety valve and has optional insulation such as mineral wool sheet and metal cladding. The Autoclave can be availed with manual opening or hydraulic opening type door. The Autoclave has heavy saddles for expanses. The Autoclave for AAC Plant ensures good slot cutting for good quality.