The invention belongs to the field of testing the hydrophobicity of silicone rubber coatings, and particularly relates to a method for testing the hydrophobicity of vulcanizing silicone rubber coating field sampling samples. The method comprises the steps that coatings sampled on a field are placed on object slides coated with water films, the vulcanizing silicone rubber coating samples which are sampled on the field are flatwise pressed on the object slides through the adsorption capacity of water and the action of the atmospheric pressure, then contact angles of the coatings can be measured with a contact angle meter, and hydrophobicity differences among different field sampling samples can be judged. According to the method, the curling problem of the field sampling samples is solved, therefore, static contact angles can be tested on the contact angle meter, and then the hydrophobicity differences among the field sampling samples are distinguished.