The invention discloses a method and device for efficient and energy-saving sludge treatment. The method of sludge treatment comprises the steps: the sludge first enters the preheating unit, and afterpreheating to 60 degrees or more, directly enters the thermal hydrolysis unit, and the high temperature pressurized steam generated after the end of the thermal hydrolysis is returned to the preheating unit to preheat the sludge. The device is a thermal hydrolysis device, including a mounting seat, a tank body, an air inlet pipe, an air guiding pipe, a nozzle, a sieve cylinder, a card slot, a loading bin, a motor, an exhaust pipe, a multi-stage electric push rod, a shaft rod, a connecting rod , block, rotating rod, mixing blade, discharge tube, brush and filter net. The method and the deviceaccelerate the speed of thermal hydrolysis, can make the steam and sludge mixing effect better, and also save the cost, greatly improve the work efficiency, reduce the work intensity of the staff, andalso enhance the work. Practicality.