The invention provides a slow-release multi-layer dental implant and its preparation method and evaluation method. The implant consists of three parts: the first layer, the second layer and the third layer or simplified into two parts: the first layer and the second layer. The three-dimensional size coincides with the middle of the hole, the thickness is >1.5mm, the third layer is conical, and there is a 0.1-0.5mL gap with the bottom of the hole. The beneficial effects of the present invention are: the multi-layer dental implant has good sealability, suitable mechanical strength and long-term treatment effects, and does not use adhesives, and is easy to take out after use; its preparation process Convenient, intuitive and adjustable, fast and cheap, patients can get the implant on the spot and try out the effect and adjust the surface morphology; the provided in vitro evaluation method of multi-layer dental implant can be used to optimize the prescription of the implant technology, or supplement expert design database information for doctors to refer to for future reference.