The invention discloses an integrated column tray type flash evaporation-heat exchange apparatus. The integrated column tray type flash evaporation-heat exchange apparatus comprises a tower body which is divided into a lower evaporation chamber and an upper hot water chamber by a tower body partition plate; a column tray is arranged in the apparatus and located in a heat exchange section of the hot water chamber and below a water inlet distributor; and the column tray comprises a downcomer and a covering cap. The integrated column tray type flash evaporation-heat exchange apparatus provided by the invention realizes flash evaporation, separation of a solid phase, heating of clean water and the like of solid-containing waste water in a same tower, effectively improves a heat transfer area and heat transfer efficiency in the tower, overcomes the disadvantage of proneness to fouling and obstruction of conventional heat-exchange equipment of a same kind, greatly reduces maintenance work and cost for replacing and cleaning of a filling material, is free of environmental pollution and other problems and produces good technical economic benefits and environmental protection benefits.