<p>Organic quinone cathode materials possess several advantages, such as excellent redox activity, facilitated structural modification, and potential hydrophilic surface, that makes them highly potential in the application of aqueous zinc-ion batteries (AZIBs). Especially, many efforts are devoted to quinone polymer cathodes to inhibit their dissolution in the electrolyte and improve the cycle performance. In this paper, we synthesize a branched quinone polymer poly (1,4-benzoquinone-1,2,4,5-tetramethylenediamine) (PQBT) as AZIBs cathode material, which exhibits favorable electrochemical performance and composite application. PQBT achieves the discharge specific capacity of 165.0 mAh g⁻¹ at the current density of 0.02 A g⁻¹. And at high current density of 0.1 A g⁻¹, PQBT can maintain a capacity retention rate of 67.6% after 1100 cycles. Furthermore, the in situ composite of the PQBT and carbon nanotubes (CNT) results in improved rate performance, especially in terms of capacity at high currents.</p>