The invention relates to a different-plane microneedle array brain electrical dry 
electrode with controllable 
puncturing depth, which comprises an integral frame, a microneedle 
electrode and a microneedle 
electrode carrier, wherein the microneedle electrode is installed on the microneedle electrode carrier to form a different-plane microneedle 
electrode array, and the different-plane microneedle 
electrode array is inserted into the frame by a hole array on the frame; and moreover, the different-plane microneedle 
electrode array can carry out vertical movement in the frame. A small cylinder onthe frame is inserted into hair, the interference of the hair to the electrode is avoided, and the different-plane microneedle electrode array can be used for controlling the electrode to carry out the vertical movement in the frame so as to regulate a proper position for 
puncturing the 
scalp to reach the germinal layer of the 
skin by a control device. The different-plane microneedle array brain electrical dry electrode with the controllable 
puncturing depth is used for a brain electrode structure collecting a brain electrical 
signal. By utilizing a traditional micro-electro-
mechanical system(MEMS) process and a traditional mechanical structure, the brain electrical 
signal can be collected very well. Compared with a traditional wet electrode, a 
skin preparing step is not needed, and the different-plane microneedle array brain electrical dry electrode with the controllable puncturing depth can be used for the long-time detection of the brain electrical 
signal. According to the different-plane microneedle array brain electrical dry electrode with the controllable puncturing depth, the structure is small and exquisite, the use is convenient and quick, 
external noise is reduced, and the high-quality recording of a microvolt level brain electrical signal can be finished.