The invention discloses an automatic cake roll production line and a working method thereof, and solves the problems of low processing efficiency, irregular shape of produced cakes and bad appearanceof existing processing methods. The automatic cake roll production line comprises a front conveyor belt; a cooled flat band-shape cake is placed on a surface of the front conveyor belt; a cream applying machine is installed above the front conveyor belt; an ultrasonic cutting machine is installed on one side of the cream applying machine; a rear conveyor belt is connected, far away from the creamapplying machine, with one side of the ultrasonic cutting machine; small cakes are placed on a surface of the rear conveyor belt; a cake rolling machine is installed above the center of the rear conveyor belt; a hobbing-cutter cutting machine is installed, far away from the front conveyor belt, on one side of the cake rolling machine; support feet are connected to lower parts of both the front conveyor belt and the rear conveyor belt; and speed of the rear conveyor belt is faster than speed of the front conveyor belt.