The utility model provides a belt sludge filter press, including the frame, set up drive arrangement and defeated mud screen of electrical control device, first defeated mud screen and second and filter -pressing roller in the frame, first filter -pressing is strained the roller and is hollow spline formula, and the filter -pressing of hollow spline formula is strained the roller and is comprised hollow, a plurality of looks spaced round steel bar. The beneficial effects of the utility model are that: first main compression roller adopts the line contact design, forms with some generation face to improve pressurized -water work efficiency. When the material gets into the pressure zone, the material this district in along the screen forward operating pressure constantly strengthen, the material receives volume contraction after the extrusion force, the free water that contains reaches saturated condition, when it received the line contact and squeezes, water output speed quickening increase was 3~4 times.