The invention provides a hyaluronic acid and silica gel composition for scar prevention and early repair and a preparation method of the hyaluronic acid and silica gel composition. The method includes the steps of adding purified water to hyaluronic acid to be evenly stirred to prepare a hyaluronic acid solution, adding purified water to onion extract to prepare an onion extract solution, adding carbomer and purified water to glycerol to be evenly stirred to prepare a carbomer solution, sequentially adding the hyaluronic acid solution and the onion extract solution to the carbomer solution to be stirred, adding polydimethylsiloxane and dimethyl siloxane cross-linked polymers to be evenly stirred, making the mixture pass through a colloid mill, and obtaining the hyaluronic acid and silica gel composition. By adding natural plant extract for promoting skin wound healing, natural moisturizing factors, namely, hyaluronic acid, and siloxane polymers, the good effect of preventing scars from being formed is achieved, the effect of rapidly repairing scars in the early stage is achieved, and good effects are achieved for prevention and early repair of scars caused by general operations, traumas and burns.