A sodium benzoate waste recycling apparatus, relating to the technical field of organic chemical engineering, and comprising a bottom plate (10), support legs (11), a volatilisation chamber (13), a warm water pool (14), and a dilute acid tank (15); the bottom of the bottom plate is supported by means of four support legs (11), the volatilisation chamber (13) being fixedly arranged on the left side of the upper surface of the top part of the support legs (11), a feed inlet (17) being connected to the left side wall of the volatilisation chamber (13), the top end of the volatilisation chamber (13) being connected to the right to an air pipe (16), the tail end of the air pipe (16) extending into the upper surface of the bottom plate (10) on the right side of the volatilisation chamber (13), a heat dissipation opening (31) being disposed on the inner bottom part of the volatilisation chamber (13), a hot air generating apparatus (23) fixed to the lower side of the bottom part of the bottom plate (10) being arranged at the bottom end of the heat dissipation opening (31), a temperature detection instrument (22) being arranged on the upper right side of the warm water pool (14) and a pH meter (21) being arranged on the upper left side of the warm water pool (14), the right side of the warm water pool (14) being connected to the right by means of an acid intake pipe (18) to the dilute acid tank (15) arranged on the upper surface of the bottom plate (10), and an anti-corrosion agent outlet (19) being disposed at the bottom end of the warm water pool (14).
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