In order to treat the harmful acid wastewater from the refining process of 3-nitro-1，2，4-triazol-5-one （NTO）， the basic ion exchange resin was used to treat the wastewater and recover NTO. The resin with better adsorption effect was screened among four commercial resins（D301，D201，D311，IRA402）， and the effects of adsorption time and initial concentration on the adsorption of NTO by the resins were studied. In the dynamic adsorption experiment， the pH， initial concentration and flow rate of the simulated wastewater were screened to obtain the best adsorption conditions， and the desorption agent with better effect was screened. Five repeated experiments of adsorption and desorption were carried out under optimal conditions， and the desorption solution was acidified and extracted to recover NTO. The results show that D301 wet resin has good adsorption capacity for NTO， and the adsorption curve conforms to Langmuir equation. The theoretical saturated adsorption capacity can be inferred from the equation to be 232 mg·mL^-1. When the initial concentration of the simulated wastewater is 8 mg·mL^-1， the flow rate is 3 BV·h^-1， and the pH is 3， the adsorption effect of D301 is the best， and the saturated adsorption capacity is 205 mg·mL^-1. The resin is desorbed by 10% NaOH solution， and the best desorption rate can reach 98%. In repeated experiments， the recovery rate of NTO is 82%-88%， indicating that the resin has stable performance and can be recycled. In conclusion， the method of using basic ion exchange resin to adsorb NTO in wastewater is feasible and has practical application prospect.