A sink applied to a system for recovering and reusing graywater includes a sink body, including a water basin located at an upper part of the sink body and a cavity located at a lower part of the sink body. The water basin comprises a water outlet configured to be connected to a sewer. The sink also includes a sink graywater recovery pipeline configured to be connected to the water outlet. The sink also includes a washing device configured to be connected to the sink graywater recovery pipeline. The sink also includes a switching device configured to switch between the sewer and the sink graywater recovery pipeline. When the switching device opens the sewer and closes the sink graywater recovery pipeline, the graywater is led into the sewer and discarded. When the switching device opens the sink graywater recovery pipeline and closes the sewer, the graywater is led into the washing device.