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In this paper, a direct unsymmetrical dimethylhydrazine/H2O2 fuel cell based on a Nafion membrane and Pt/C catalyst is developed, focusing on the effects of different operating parameters on the cell performance, including the cell operating temperature, the concentration of added electrolyte (NaOH, H2SO4), the concentration of oxidant (H2O2), and the volume flow rate of the feed. The experimental results show that the direct unsymmetrical dimethylhydrazine fuel cell reaches a maximum power density of 129 mW.cm−2 at a current density of 234 mA.cm−2, a limiting current density of about 420 mA.cm−2, and an open circuit voltage of up to 1.37 V. The cell performance reaches a good state at a NaOH concentration of 2.0 M and 5.0 M in the low and high current density region, respectively. This study provides a new pathway to the reuse of highly concentrated unsymmetrical dimethylhydrazine waste fluid generated in military and space launch missions.