The application belongs to the technical field of laser-induced forward transfer (LIFT) and in particular relates to a triazene mixture and a preparation method thereof. The triazene mixture provided by the invention is prepared from triazene and polydimethylsiloxane; the triazene mixture is easy to form on an interface of air; a preparation process of a LIFT source part is simplified; the shape accuracy of material deposition is improved; the requirements of a LIFT technology on forming of a sacrificial layer when a complex shape is deposited can be met; application of the LIFT technology to scientific experimental research of biomedicine is promoted.