The invention discloses a horizontal turntable evaporator, comprising a first main shaft, a second main shaft, a heating component and an outer cylinder. The first main shaft and the second main shaft are same in structure and size, and are arranged horizontally in parallel; the heating component comprises a plurality of heating plates installed on the first main shaft and the second main shaft, the gaps between the adjacent heating plates on the first main shaft and the second main shaft are equal, and the heating plates on the first main shaft and the heating plates on the second main shaft are arranged at intervals and engaged with each other. The evaporator can effectively evaporate liquid, is simple in structural design and large in heat transfer area, can achieve a very large heat exchange area with small size, is low in energy consumption, and can realize self-cleaning.