The invention discloses a device and technology used for coagulation sludge dewatering processing. The device comprises a dewatering chamber with a water inlet pipe and a water outlet pipe. The dewatering chamber comprises a filtering film for filtering sludge entering the dewatering chamber from the water inlet pipe and a heating device for heating the sludge, and further comprises a locking device for locking a door of the dewatering chamber. The specific operation technology includes the steps that a, the sludge generated in a prior working procedure flows into the dewatering chamber through the water inlet pipe; b, the sludge is filtered through the filtering film, and meanwhile the dewatering chamber is heated through the heating device; c, water passes through the filtering film to flow out from the water outlet pipe; d, water left in the sludge is heated into steam to overflow out from small holes in the upper portion of the dewatering chamber; e, after the sludge in the dewatering chamber is completely dried, the locking device of the door is unlocked to open the door, and the sludge in the chamber is discharged. According to the device and technology, the structure is simple, the dewatering rate is high, and the device and technology are economical and capable of being suitable for dewatering various kinds of coagulation sludge such as the sludge generated through an electric coagulation method and the sludge generated through a chemical coagulation method.