An economy class cabin with sleeping berths in a passenger aircraft, includes cabin floor, multi-tier sleeping berths, an air duct, an overhead bin, seats, a baggage storage place, a shoe storage place and multi-tier baggage racks. The multi-tier sleeping berths are disposed in parallel to longitudinal axis of the aircraft; a longitudinal partition board is disposed between two abreast sleeping berths; and two latitudinal partition boards are respectively disposed at two opposite ends of each of the sleeping berths and a private space is formed by the longitudinal partition board, two latitudinal partition boards, a bed cushion and a slidable curtain. The present invention has simple structure and reasonable utilization of compact space, enables all or some of passengers of the economy class to be in a lie-flat sleeping state in half of the time in intercontinental flight.