Roller-type washing and drying machine

The invention provides a roller-type washing and drying machine comprising a rotation barrel which has multiple through holes on surrounding walls, a water holding trough of the rotation barrel, an air supplying unit for supplying the air to the rotation barrel, a heating unti for heating the air, an air supplying path for guiding the heated air to the water holding trough, a heat exchange path for guiding the air to the air supplying unit and dehumidifying, and a control unit for controlling each process, wherein the water holding trough comprises a recess arranged on the back of the water holding trough, and a water path which extends along the rotating direction during the dehydration process and is connected with the recess; and as the turbulence is generated when the water in the crack between the undersurface of the rotation barrel and the back of the water holding trough runs into the fault wall of the recess of the water holding trough, the invention can prevent the situation during the dehydration pr