The invention discloses an alternating current electrified railway uninterrupted intelligent phase splitter. The alternating current electrified railway uninterrupted intelligent phase splitter comprises two high-speed switches, an arc extinction adjustable power supply, a neutral zone voltage transition step phase-shift power supply and an intelligent phase splitter control unit with a train pantograph type current collector position identifying function. The intelligent phase splitter control unit can determine positions of train pantograph type current collectors in overlapping sections andneutral zones on the two sides according to voltage and current information in the device. The arc extinction adjustable power supply is connected to a first high-speed switch circuit or a second high-speed switch circuit in series so that most currents of all pantograph type current collectors in the overlapping sections and the neutral zones flow through the first high-speed switch or the second high-speed switch to suppress or eliminate electric arcs of the train pantograph type current collectors during entering or leaving the neutral zones. The step phase-shift power supply can generatemultiple different intermediate voltages with phases between a first power supply arm voltage and a second power supply arm voltage so as to guarantee that the train is stably transitioned from a first power supply arm section to a second power supply arm section without being powered off.