The invention discloses an electronic ring latch, relating to an improvement on the structure of an electronic ring latch. The invention provides an electronic ring latch, which has a simple structure and high safety. The electronic ring latch comprises a lock body, a lock core and a U-shaped latch hook. The structural key points are that: the top end of the lock core is connected with the inner wall of the lock body through a torsion spring; one side of the top end of the lock core is provided with a ball groove corresponding to a ball; the lock core is provided with a magnetic block unit corresponding to a coil; the magnetic block unit comprises a fixed magnetic block and a sliding magnetic block; the fixed magnetic block is embedded into one side of the lock core; the sliding magnetic block is arranged in a magnetic block groove on the other side of the lock core; magnetic poles of the fixed magnetic block and the sliding magnetic block are arranged oppositely; a clamping groove isformed in the lock body corresponding to the sliding magnetic block; and the depth H of the magnetic block groove, the length L of the sliding magnetic block and the depth h of the clamping groove decrease in sequence.