The invention provides a system for recycling acid-alkali regeneration wastewater from an ion exchange tower. The ion exchange tower is connected to a recovered salt water storage tank and a waste salt water storage tank. A recovered salt water pump is arranged on a liquid outlet pipe of the recovered salt water storage tank. A waste salt water storage tank is arranged on a liquid outlet pipe of a waste salt water storage tank. A communicating pipe is arranged between the recovered salt water pump and the waste salt water pump, and a return pipe connected to the waste salt water storage tank is arranged on the communicating pipe. The invention also provides a method for recycling acid-alkali regeneration wastewater from an ion exchange tower. The waste water recycling system provided by the present invention is capable of achieving recycling of regeneration waste water in the waste salt water storage tank by utilizing the existing pipe from the recovered salt water storage tank to a primary salt water storage tank. A pH value measuring device is arranged on the return pipe to guarantee that a pH value at the outlet of the waste salt water pump is greater than 7, thereby avoiding influence on normal production in a salt dissolving procedure. The method provided by the invention has the advantages of reducing sewage discharge, saving water supplementation amount for salt dissolving production water of the primary salt water storage tank, and lowering the production cost.