The invention discloses a forming method of colored silica gel. The method comprises the following steps of: A, laying a polytetrafluoroethylene sheet into a first die, and performing hot-press molding, so as to produce a colored silica gel die enabling colored silica gel to be formed, B, laying colored silica gel pigment on the colored silica gel die, and performing hot-press molding, C, removing sides of the colored silica gel subjected to hot-press molding, and then laying the colored silica gel into a jig, D, laying another polytetrafluoroethylene sheet into a second die, and performing hot-press molding, so as to produce a forming die ensuring that bottom color silica gel and colored silica gel are formed together, E, laying the colored silica gel in the jig in a preset position of the forming die, laying bottom color silica gel material in the rest positions of the forming die, and performing hot-press molding, and F, taking out pressed silica gel pieces after pressing, so as to obtain finished colored silica gel products. The method ensures that colored silica gel which easily has the problem of flash is singly subjected to hot-press molding, solves the problem of flash, improves the capacity, reduces the reject ratio of products and production cost, and is high in profit ratio.