The invention discloses an intracranial cortex electrode. The intracranial cortex electrode is composed of an insulated flexible substrate, multiple electrode points embedded in the flexible substrate, electrode wires buried in the flexible substrate and electrode sleeves collecting the electrode wires. Due to a channel formed in the flexible substrate, obstructive tissue fluid between the electrode and brain tissue can be easily discharged, the fitness of the electrode on the brain tissue can be improved, and then monitoring quality can be guaranteed; besides, the intracranial deep electrode can enter the deep brain conveniently through the channel to detect brain electrical activity signals of deep brain tissue. Meanwhile, according to needs, a reinforcing net can be buried in the flexible substrate, and different electrode wire outlets can be formed in the flexible substrate.