A washing-drying/drying machine comprising: a tub mounted in a cabinet having a first duct communicating member formed at the one side of the upper part of the circumference of the tub while being protruded outward, a second duct communicating member formed at the upper part of the tub, a drum rotatably disposed in the tub for receiving laundry (m); a drying duct connected to the first duct communicating member and the second duct communicating member in fluid communication to provide a passage for hot air to flow to the tub; a heater provided in the drying duct to generate heat air; a circulating fan; a cooling water supply unit for supplying cooling water to one side of the tub; and a condensing plate mounted at the inner wall of the tub, such that the cooling water supplied to one side of the tub flows between the inner wall of the tub and the condensing plate, for condensing moisture of air used to dry laundry and flowing between the drum and the condensing plate; whereby a cooling water channel for flowing the cooling water therethrough is formed between the condensing plate and the inner wall of the tub; characterised in that the first duct communicating member is formed in tangential direction, the second duct communicating member is formed at the front side of the tub, the circulation fan is located between the first duct communicating member and the drying duct; and an air channel separated from the cooling water channel is provided between the condensing plate and an outer wall of the drum for upwardly flowing air flowing from the drum to the first duct communicating member therethrough, said air channel being formed such that air exhausted from the drum is condensed by contacting with the condensing plate. a tub mounted in a cabinet having a first duct communicating member formed at the one side of the upper part of the circumference of the tub while being protruded outward, a second duct communicating member formed at the upper part of the tub, a drum rotatably disposed in the tub for receiving laundry (m); a drying duct connected to the first duct communicating member and the second duct communicating member in fluid communication to provide a passage for hot air to flow to the tub; a heater provided in the drying duct to generate heat air; a circulating fan; a cooling water supply unit for supplying cooling water to one side of the tub; and a condensing plate mounted at the inner wall of the tub, such that the cooling water supplied to one side of the tub flows between the inner wall of the tub and the condensing plate, for condensing moisture of air used to dry laundry and flowing between the drum and the condensing plate; whereby a cooling water channel for flowing the cooling water therethrough is formed between the condensing plate and the inner wall of the tub; characterised in that the first duct communicating member is formed in tangential direction, the second duct communicating member is formed at the front side of the tub, the circulation fan is located between the first duct communicating member and the drying duct; and an air channel separated from the cooling water channel is provided between the condensing plate and an outer wall of the drum for upwardly flowing air flowing from the drum to the first duct communicating member therethrough, said air channel being formed such that air exhausted from the drum is condensed by contacting with the condensing plate.