An embodiment of the invention discloses an MVR evaporator. The MVR evaporator comprises a housing (1) and a plurality of heat exchange tubes (2) vertically arranged in the housing (1), wherein a bottom surface (11) of the housing (1) is inclined, so that the plurality of heat exchange tubes (2) on the bottom surface (11) have multiple lengths, and a liquid outlet (13) is formed in a side wall (12), connected with a lowest part of the bottom surface (11), of the housing (1). The MVR evaporator in the technical scheme can reduce the risk of mixing distilled water with pollutants, thereby improving the quality of final effluent of the MVR evaporation system; in addition, the MVR evaporator also has a larger heat exchange area, thereby improving the heat exchange efficiency of the MVR evaporator.