The invention discloses a surface treatment process for hydrophilic-group 
silica gel. The surface treatment process for the hydrophilic-group 
silica gel comprises the following steps: (1) a pluralityof 
silica gel parts are placed in an emptying jig at intervals; (2) a hydrophilic-group 
machine is started, and hot gas is discharged; (3) a plurality of hydrophilic-group lamp pipes are turned on from a cold state, and 
illuminance and a temperature in a tunnel furnace start to rise; and (4) a conveying belt conveys the emptying jig into the tunnel furnace, the hydrophilic-group lamp pipes irradiate the outer surfaces of the plurality of silica gel parts on the emptying jig, high-energy photons irradiated from the hydrophilic-group lamp pipes break 
oxygen atoms in air, and the reaction equation is that O2 is decomposed into O and O; and meanwhile, the high-energy photons break the 
structural formula of methyl vinyl 
silicone rubber in the silica gel parts to obtain CH3, the broken 
oxygen atoms are reacted with the methyl vinyl 
silicone rubber to generate hydrophilic groups CHO-, OH- and COH-. The surfaces of the silica gel parts treated through the surface treatment process for the hydrophilic-group silica gel are smooth, and better hand feeling during touch is achieved; and meanwhile, the fitting degree and the antifouling property of the surfaces of the silica gel parts are greatly improved, and in the 
generation process for the hydrophilic groups, 
pollution is completely avoided, and higher environment friendliness is achieved.