A sludge solidification machine includes a machine shell, a transmission apparatus, a medicine liquid mixing and reaction apparatus and also comprises: a porous cloth dehydration apparatus, a tightening apparatus, a gravity dehydrating roller apparatus, a porous pre-pressing dehydrating roller, a deeply high-pressure dehydrating roller, a butt-clamping extrusion roller, a position-correction apparatus, a pneumatic apparatus, two circulating filter screens, a washing apparatus, a material unloading apparatus, a bearing and a bearing base, and a filtration collecting apparatus, which are all arranged in the machine shell. The two circulating filter screens are driven by the transmission apparatus, wherein one is a circulating upper-layer filter screen and the other is a circulating lower-layer filter screen. By means of the circulating transmission structure of the two circulating filter screens, fed sludge is transmitted to the dehydration apparatus, the washing apparatus and the correction apparatus on the circulation line for being treated. After the treatment, a solidified filter cake is scraped away through the material unloading apparatus. In addition, the apparatuses are all arranged inside the machine shell, so that the sludge solidification machine is simple in appearance, is less in occupied area and is convenient to move.