The present invention relates to a method for manufacturing a triple cross-linked collagen, which comprises the following steps: providing a soluble collagen sample; mixing the collagen sample with a first cross-linking agent to form a one cross-linked collagen; mixing the first cross-linked collagen with a second cross-linking agent to form a second cross-linked collagen; and mixing the second cross-linked collagen with a third cross-linking agent to form a triple cross-linked collagen, wherein each of the first cross-linking agent, the second cross-linking agent, and the third cross-linking agent is selected from the group consisting of an aldehyde cross-linking agent, an imine cross-linking agent, and an epoxide cross-linking agent. In addition, the first cross-linking agent is different form the second cross-linking agent, and the third cross-linking agent is different form the first cross-linking agent and the second cross-linking agent.