The invention relates to a method for detecting chloride in reclaimed water. The method is characterized by comprising steps as follows: a silver nitrate standard stock solution and a silver nitrate standard working solution are prepared, a chart method is established to correct an end point error, and fast sample detection and concise computation are realized. An automatic titration apparatus is characterized by comprising an electric gas pump, a power supply, a timer, a gas pipe and a brown acid type automatic burette, wherein the brown acid type automatic burette is sequentially connected with the miniature electric gas pump, the power supply and the timer through the gas pipe. The method and the titration apparatus have the benefits as follows: an operation method of GB11896-89 chloride determination-silver nitrate titration is optimized; preparation and storage methods of the silver nitrate standard stock solution and the silver nitrate standard working solution are developed, the chart method is established to correct the end point error, the titration apparatus is improved, and automation is realized, so that the effects of simple operation, simplified steps, rapid computation, reduced pollution and reagent saving are realized.