This paper investigates the finite-time bipartite consensus problem for discrete-time first-order signed multi-agent systems based on quantized information. Firstly, a discrete protocol is proposed for the positional information of each agent to ensure that the states of multi-agent reach consensus within finite time. Subsequently, the designed control protocol is analyzed using the Lyapunov theorem, through which sufficient conditions for achieving bipartite consensus in finite time are derived. Finally, numerical simulation experiments are conducted to validate the theoretical conclusions obtained in this study.