Alternating current direct energy supply electrolysis device and system

The invention discloses an electrolysis device and system directly supplied with energy by alternating current. The electrolysis device directly supplied with energy by alternating current comprises an excitable magnetic circuit, an annular electrolytic tank and an alternating current power supply, electrolyte is injected into the annular electrolytic tank; the annular electrolytic tank comprises an electrolytic tank diaphragm, an electrolytic product output pipeline and an electrolyte supplementing pipeline; the electrolytic tank diaphragm is used for dividing the electrolyte into a cathode chamber and an anode chamber; the cathode chamber and the anode chamber are respectively provided with a cathode plate and an anode plate; a circuit between the cathode plate and the anode plate is short-circuited; the excitable magnetic circuit comprises a plurality of magnetic cores wound with electromagnetic coils; the magnetic core is arranged outside the annular electrolytic tank, and the upper end and the lower end