This work presents a study on discharge-enhanced femtosecond laser-induced plasma spectroscopy. The results indicate that the discharge significantly enhances the spectral line intensities. At 7 kV, the intensities of the three spectral lines (Cu II 521 nm, Cu II 578 nm, and Cu I 793 nm) are enhanced by factors of 22, 31, and 36, respectively, compared to those without discharge. Different spectral lines exhibit distinct responses to the applied voltage. Time-resolved spectral analysis reveals that the discharge-induced enhancement primarily originates from the prolongation of the plasma fluorescence lifetime. This study provides a reference for the development of highly sensitive and stable plasma spectroscopic analysis techniques.