The dependence on fossil fuels has been rapidly increasing with the development of technology. It is imperative to develop eco-friendly green energy, such as thermoelectrics. Particularly, copper(I) telluride is a promising thermoelectric material. However, the synthesis of copper(I) telluride remains in bulk, and copper(I) telluride thin film is still missing. In this work, we use solid-state chemical reaction to grow copper(I) telluride thin films on graphene. Graphene serves as growth template for van der Waals epitaxy of copper(I) telluride and diffusion barrier, and finally exhibit excellent thermoelectric and electromechanical properties. The aforementioned material properties can achieve self-powered strain sensors, which can generate electricity by lateral temperature differences and provide fast and durable stress sensing. It has the potential to become a portable autonomous health monitoring sensors, which not only make our life more convenient but also show the prospect of two-dimensional copper(I) telluride and graphene heterostructures.