Electrode placement position determining device and method for scalp electroencephalogram

The invention relates to a measurement device for determining an electrode placement position and used for scalp electroencephalogram. The measurement device comprises four main hollow tapes, four side-edge hollow tapes, a top button and eight sliding buttons, wherein the initial ends of the four main hollow tapes are fixed to one point by the top button; the main hollow tapes and the side-edge hollow tapes are provided with hollow tracks extending along the extending direction of the tapes and the hollow tracks are used for allowing the sliding buttons to slide; each side-edge hollow tape is connected with the hollow tracks of the two adjacent main hollow tapes respectively through the two sliding buttons arranged in the hollow track of the side-edge hollow tape, so that each sliding button slides in the hollow tracks of one side-edge hollow tape and the corresponding main hollow tape simultaneously, and scales are marked on the hollow tapes. In use, the measurement device covers the surface of the brain of