The invention discloses a brain wave nerve-calming sleep-improving instrument which relates to the technical field of health caring equipment. The brain wave nerve-calming sleep-improving instrument according to the invention comprises a front cover assembly, a back cover assembly, a control assembly and a massage assembly. The back cover assembly comprises a silica gel block and a back cover body. The silica gel block is provided with a regulating hole. The back cover body is provided with a mounting hole. The silica gel block is connected with the back cover body. The front cover assembly and back cover body are detachably connected and form a mounting space. The mounting hole is communicated with the mounting space. The control assembly comprises a control circuit board and a storage battery. The control circuit board is electrically connected with the storage battery. The massage assembly comprises a microwave electrode, an electrode fixing member, an elastic pressing plate and aneccentric motor. The microwave electrode is connected with the elastic pressing plate through the electrode fixing member. The microwave electrode is exposed from regulating hole and slide relative tothe regulating hole. The brain wave nerve-calming sleep-improving instrument can alleviate fatigue and improve sleep, and furthermore improves body health of the user.