The invention discloses novel flexible silica gel and a preparation method thereof, and belongs to the technical field of flexible silica gel. The preparation method of the novel flexible silica gel uses the following components: deionized water, a silica gel material, carbon black, a vulcanizing agent, a bridging agent, an antistatic agent and hydroxymethyl cellulose, and further uses the following components: an anti-aging agent, a tackifying agent and a filler. According to the method provided by the invention, the hydroxymethyl cellulose and the deionized water are put into a reaction kettle, stirring and heating are performed, then the silica gel material, the bridging agent, the anti-aging agent, the tackifying agent and the filler are put, so that the flexible silica gel has a better anti-aging effect and does not cause breakage or slitting after being used for a long period of time, the problem that the service life is reduced because flexible silica gel has a larger permanentdeformation rate after being subjected to stretching action can be avoided, and the flexible silica gel can eliminate most of mechanical stress and has shock absorption protection effects, has stablephysical and chemical properties and low production costs, and is suitable for promotion and applications.