The invention relates to the technical field of self-defense devices, more specifically to a novel self-defense device. The novel self-defense device comprises finger cover frames, bore spine mechanisms, finger cover holes, adjustment mechanisms and connection mechanisms. The device is sleeved on four fingers except the thumb, is used for self-defense and can be used without charging. The novel self-defense device is suitable for palms with different sizes and is suitable for fingers with different thickness. Users can feel very comfortable when wearing the device and the self-defense strengthcan be adjusted as needed. The bore spine mechanisms, finger cover holes and the adjustment mechanisms are arranged in the finger cover frames. There are four finger cover frames and two adjacent finger cover frames are connected through the connecting mechanisms.