The invention relates to a surface treatment method and a surface treatment device for rubber members. The invention provides a surface treatment method and a surface treatment device for low hardness rubber members having follow property without OPC pollution and leakage problems. The rubber members are filled with and dipping in a first surface treatment liquid containing isocyanate and organicsolvent, after forming a dipping layer, surface of the rubber members are continuously treated by a second surface treatment liquid for removing part isocyanate of the dipping layer under condition of not contacting with air.