Earphone system capable of being used for monitoring electroencephalogram in auditory meatus

The invention provides an earphone system capable of being used for monitoring an electroencephalogram in an ear canal, which comprises a left electroencephalogram acquisition earplug and a right electroencephalogram acquisition earplug which are respectively connected with an electroencephalogram acquisition PCB (Printed Circuit Board) module through conductive copper wires, the grounding electrode is installed on a conductive copper wire connecting the left electroencephalogram collection earplug and the electroencephalogram collection PCB module, the left electroencephalogram collection earplug and the right electroencephalogram collection earplug are the same in structure and each comprise an earplug body, conductive copper coils are installed on the earplug bodies and connected with the electroencephalogram collection PCB module through the conductive copper wire, and the left electroencephalogram collection earplug and the right electroencephalogram collection earplug are connected through the conductiv