The invention discloses a foam type conductive colloidal skin-friendly dressing as well as a preparation method and application thereof, and relates to the technical field of conductive materials. The foam type conductive colloidal skin-friendly dressing is prepared from the following raw materials in parts by weight: 1 to 10 parts of polyvinyl alcohol, 1 to 10 parts of polyvinylpyrrolidone, 15 to 25 parts of polyethyleneimine, 1 to 5 parts of cross-linking agent, 1 to 5 parts of softener, 1 to 5 parts of stabilizer, 10 to 90 parts of water and 5 to 10 parts of conductive filler. Effective crosslinking is completed through reasonable proportion regulation and control, the skin-friendly foam type conductive adhesive with a pore channel structure is formed, the formed conductive adhesive is small in density and small in resistance, can meet the application requirement of a human body sensor electrode, and is non-toxic to skin, biodegradable and good in biocompatibility. The traditional Chinese medicine composition is free of irritation to skin, low in manufacturing cost and safe to use, and has a good economic effect. The method can be widely applied to preparation of a pipeline sealing anti-leakage agent, flexible medical electronic equipment, a sensor electrode or an auxiliary buffer electrode.