In the energy field, classical thermal machines (such as engines) are subject to thermodynamic cycles (such as Carnot cycle, Otto cycle). Their working efficiency faces thermodynamic limits. Therefore, solutions to break through this dilemma must be sought. With the development of quantum mechanics, quantum and classical thermodynamics can been combined to become new quantum thermodynamics. Therefore, the development and application of quantum thermodynamics will be an important way to solve the thermodynamic limits in classical thermodynamics. This paper will introduce the current state of the art in quantum technology in the field of energy, including quantum heat engines, quantum refrigerators and quantum heat pumps to make readers understand the current development trend of quantum thermal machines. In the future, the more efficient heat engines can be developed through quantum technology to break through the bottleneck of traditional thermal machines. Quantum thermal machine engineering can be established to develop new quantum thermal machine products.