The　nonlinear　parity-time-symmetric　wireless　power　transfer　(PT-WPT)　system　has　garnered　significant　attention　for　its　robustness　against　variations　in　the　coupling　coefficient.　Currently,　the　implementation　of　nonlinear　negative　resistance　primarily　relies　on　switch-mode　converters.　Among　these,　the　conventional　PT-WPT　system　based　on　self-excited　converters　faces　challenges　such　as　limited　output　power　and　overall　system　efficiency　(OSE).　In　this　article,　we　propose　a　novel　dual-supply　self-excited　PT-WPT　system　designed　to　address　these　challenges,　offering　a　cost-effective　solution.　We　present　the　circuit,　coupled-mode　model,　and　PT-symmetric　condition　of　the　proposed　system.　Furthermore,　stability　criteria　of　the　system　at　each　equilibrium　point　are　analyzed　using　Lyapunov＇s　first　method.　Finally,　we　implement　a　single-supply　system　to　validate　the　correctness　of　the　models　and　stability　criteria.　In　addition,　a　dual-supply　system　is　constructed,　achieving　an　output　power　of　101.2　W　with　OSE　of　89.2%.