The invention discloses a waste acid recovery apparatus, which comprises a waste acid tank, a flow meter, a pressure gauge, an electric control cabinet, a manual valve, a transmission cable and at least two automatic valves, wherein the waste acid tank is connected with a waste acid inlet of a treatment tank sequentially by a waste acid pump and a first security filter, a water tank is connected with a water inlet of the treatment tank sequentially by a water pump and a second security filter, a recovered acid outlet of the treatment tank is connected with a recovered acid tank, a wastewater outlet of the treatment tank is connected with a wastewater tank, multiple treatment tanks with different sizes are provided, and a corresponding amount of waste acid treating resin is arranged in each model of treatment tank. The waste acid recovery apparatus disclosed by the invention can carry out effective recovery and regeneration on waste acids, the treatment amount of waste acids is large, and the recovery rate is high; and the apparatus is small in occupied land, more in model, less in investment cost, and less in used control parts, at least two three-way automatic valves can be used, the apparatus can serve to small and medium-sized enterprises in a vehicle-mounted mode, and the design of the apparatus can be adjusted according to the requirements of resource recovery of enterprises.