The invention discloses a proton exchange membrane fuel cell flow channel. The proton exchange membrane fuel cell flow channel comprises at least one branch flow channel, wherein a plurality of geometric partition structures with variable contact angles are arranged on the flow channel wall of each branch flow channel in the flow direction of gas and the water drainage direction, and the contact angles of the geometric partition structures with the variable contact angles are reduced sequentially from each branch flow channel inlet to the corresponding branch flow channel outlet. The proton exchange membrane fuel cell flow channel has the advantages of being simple in structure, easy to process and low in cost; due to the fact that the contact angle gradual change structures of different partition areas are arranged in the flow direction of the gas, the contact angles in each branch flow channel are reduced sequentially from the corresponding inlet to the corresponding outlet, the hydrophilicity gradually increases, and therefore surface tension gradients of water drops exist on each branch flow channel wall face, the transmission driving force of the water drops is increased in the decreasing direction of the contact angles of each branch flow channel, transmission of the water drops from the interior of each branch flow channel to the corresponding outlet, and water generated on a cathode can be fast drained to the corresponding outlet through each branch flow channel.