The utility model discloses a drawing device based on brain -computer interface for realize through obtaining the E. E. G signal that the module of should drawing includes to the control of drawing machine: a E. E. G acquisition unit for obtaining the E. E. G signal, be used for sending the transmitting element of E. E. G signal, the transmitting element is connected with E. E. G acquisition unit electricity, be used for receiving the receiving element of E. E. G signal, receiving element and transmitting element communication connection, be used for handling and generating the E. E. G signal control command's processing unit, processing unit is connected with the receiving element electricity, be used for the drive unit that the drive was drawn according to control command, drive unit is connected with the processing unit electricity, a drawing unit, drawing unit is connected with the drive unit electricity for being based on drive unit's drive is drawn. adopt the technical scheme of the utility model, through the motion of the E. E. G signal control guide rail that acquires, the function is realized drawing by fixed painting brush on the guide rail.