The chemical methods of recycling the sulfuric hydrazine with a form of salt from the high concentration wastewater and purifying the low concentration wastewater by Cu^２＋-H_２Ｏ_２ catalytic oxidizing are proposed. The first domestic mobile equipment is developed to purify wastewater containing hydrazine and recover hydrazine. The operational parameters of recovering sulfuric hydrazine is determined, and the important factors such as temperature, concentrated sulfuric acid addition and pH value in reaction are studied. Furthermore, the fundamental principle, the key technique and the operational condition is introduced. The results show that the system works with stable condition and high availability, and the average recovery rate of sulfuric hydrazine reaches 90% over, the treated wastewater is up to the national disposal standard.