The biggest problem of desalination is that it is expensive and energy consumption is high. This scheme uses solar thermal heat-collecting technology and solar green energy, which greatly reduces the energy consumption in the desalination process and provides a basis for further reducing desalination costs. For many current desalination technologies, this new slot solar catchment desalination system scheme is mainly aimed at the use of multi-stage flash ingenuation and low temperature multi-effect desalination technology.