Sludge drying system

The utility model discloses a sludge drying system. The sludge drying system comprises a sludge bin; the extruding machine comprises a first shell and an extrusion roller set arranged in a first cavity of the first shell, a first heat source inlet is formed in the first shell, the first cavity is communicated with a discharging port of the sludge bin, the extrusion roller set comprises a plurality of extrusion rollers arranged in the first horizontal direction, and every two adjacent extrusion rollers of the extrusion roller set are matched; at least one part of the plurality of extrusion rollers is rotatably arranged, and a plurality of accommodating grooves are formed in the peripheral surfaces of at least one part of the plurality of extrusion rollers; and the drying machine comprises a second shell and a first heating disc arranged in a second cavity of the second shell, and the second cavity is communicated with the first cavity. The sludge drying system disclosed by the embodiment of the utility model h