The transportation sector has a large amount of energy that is wasted, and the conversion and utilization of clean energy has become a key research direction in the industry. The integration and utilization of multiple energy sources is becoming an inevitable trend. The existing clean energy conversion technologies in the transportation sector have problems such as insufficient single energy volume and mismatched integration of multiple energy sources. In response to this, based on the energy conversion principles of mainstream energy conversion technologies, such as piezoelectric mechanical energy conversion technology and photovoltaic energy conversion technology, the power generation level and development direction of two technologies are explored, and planning suggestions for the integration and development of multiple energy sources are proposed. This paper will provide ideas for the collection and application of clean energy in the transportation sector, which will contribute to the achievement of carbon reduction goals in the transportation industry.