Disclosed is an electroencephalogram collecting cap, belonging to the technical field of electroencephalogram collection. The problems, such as not being able to adjust the size thereof, and wearing and cleaning being troublesome, in the prior art are solved. The electroencephalogram collecting cap comprises a frame and a plurality of brain electrodes movably connected to the frame, wherein the frame comprises a cross-section full-annular head hoop (1), and a coronal-section semi-annular head hoop (2)； the full-annular head hoop (1) and the semi-annular head hoop (2) respectively realize extension and retraction by means of a continuous retracting device； two ends of the semi-annular head hoop (2) are respectively fixed to the full-annular head hoop (1)； and a tail end of each brain electrode is provided with a liquid storage device (3), a head end of each brain electrode is provided with a plurality of grippers (4), a conductive contact (5) is arranged at the position, in contact with the scalp, of each gripper (4), and the conductive contact (5) communicates with the interior of the liquid storage device (3). The electroencephalogram collecting cap can adapt to various types of head sizes, and at the same time, as the liquid storage device (3) is used, the electroencephalogram collecting cap can easily penetrate hair and make good contact with the scalp, thus conforming to the rules of ergonomic design and having a good practicability.La présente invention concerne un capuchon de collecte d'électroencéphalogramme, appartenant au domaine technique de la collecte d'électroencéphalogramme. Les problèmes, tels que celui de ne pas être capable d'ajuster sa taille, et le port et le nettoyage sont gênants, dans l'état de la technique sont résolus. Le capuchon de collecte d'électroencéphalogramme comprend un cadre et une pluralité d'électrodes cérébrales reliées de manière mobile au cadre, le cadre comprenant un arceau de tête entièrement annulaire (1) à section transvers
