A power save method, an AP device and an STA device are provided. According to whether power save is allowed in a current TXOP and whether a station STA is newly added in an operation object identifier of a subsequent frame of each frame of the current TXOP, the AP device respectively sets a TXOP power save indication of each frame, and when the TXOP power save indication of the current frame is power save allowed, the STA device determines whether to enter the Doze state according to a judgment result for a doze condition. The adoption of the method and the device can expand the power save application range, and enhance the power save effect.