This invention discloses a new method for innocuity of mud including the following steps: 1, putting dehydrated mud into a mixing basin to adjust the pH value to 8-9 and mixing them and inputting them to an anaerobic tower, 2, the mud mixture is fermented and separated automatically in the tower, 3, marsh gas is used in burning and generation, 4, the solution is used in fertilizing farms and the part can't be used passes through a SBR biochemical process device and enters into a slant pipe to be deposited and separated in solid and liquid, mud flows back and the water is discharged if meets the standard, 5, the slags are mixed with the mud discharged by the SBR process device and enter into a ferment basin for the second fermentation, 6, material of the fermentation basin is input into a fertilizing process to be dried, cooled, crushed, screened, packaged and get agricultural high efficient organic fertilizer.