The invention provides an insulator hydrophobicity modification processing device. Structure of the device comprises an insulator chuck, a hydrophobicity modification large area jet reactor, an insulator hydrophobicity modification processing device reaction chamber supporting shell, a liquid precursor mixing chamber, a working gas shunting device and a fixing support. The insulator chuck is fixed on the internal wall of the insulator hydrophobicity modification processing device reaction chamber supporting shell. The hydrophobicity modification large area jet reactor is fixed on the bottom part of the insulator hydrophobicity modification processing device reaction chamber supporting shell through the fixing support. The liquid precursor mixing chamber is connected in series with the working gas shunting device and the hydrophobicity modification large area jet reactor in turn. The advantages are that 1, an efficient and environment-friendly insulator hydrophobicity modification processing means is provided; 2, the structural arrangement of the large area jet reactor is optimized; 3, the compatibility is high; and 4, insulator surface flashover voltage is enhanced.