The invention relates to turnover upper and lower berths, characterized in that a carriage is provided with side walls, a turnover upper berth is arranged above the side walls, baffle plates are respectively arranged at two side ends of the upper berth, and an upper berth positioning stop mechanism is arranged on the baffle plates; backrests are fixed on the side walls of the carriage, a sliding bedding which can slide is arranged on berth legs, and a turnover bedding is arranged at one side of the sliding bedding; and a guide rail support is arranged on the berth legs, a slide positioning mechanism is arranged on the guide rail support, and the sliding bedding is in sliding connection with the guide rail support through the slide positioning mechanism. In a berth state, waist backrests need to be turned downward and positioned on a plane in the same height with the lower berth to form a lie-down berth surface, and armrests are turned upward and tightly close to partition walls, so that the upper and lower berths are consistent with the traditional berths in form; and in a seat state, the waist backrests are turned upward and tightly close to the partition walls, the lower berth retracts and pushes the waist backrests and the armrests are turned downward to form the seat state, and the upper berth also needs to be turned upward for a certain angle to enable the space to be more suitable for seating.