The invention relates to a method and a device for finger ring gesture door opening. A finger ring is used as a key; by virtue of gesture motion detection and Bluetooth communication, a switch of an electric control lock is controlled, and a simple, quick and convenient door opening mode is realized; a sensor in the finger ring sends a motion signal of a finger to a controller; the controller detects a specific gesture signal and transmits a door opening signal to a lock-end singlechip microcomputer through Bluetooth communication; the lock-end singlechip microcomputer controls a relay to be closed after acquiring the door opening signal so as to implement door opening of the electric control lock. The device comprises a finger ring end and an electric control lock end, wherein the finger ring end comprises a sensor module, a controller module and a Bluetooth module; the electric control lock end comprises a Bluetooth module, a singlechip microcomputer module and a relay module. The invention aims at providing the method and the device for finger ring gesture door opening, which are easy to operate, convenient mount and wide in application field, based on a micro chip and the Bluetooth communication.