Abstract: Dish solar thermal power generation system is characterized by high conversion efficiency, thermal energy storage and good economy. However, the large-scale application of existing dish solar power systems is limited by its bulky concentrators, complex thermoelectric converter structures, low power-to-mass ratios, and high construction costs. A portable concentrating solar thermal-mechanical-electrical conversion device (CST-M-ECD) is designed in this paper. Firstly, according to the system heat input and expected indicators, the device collector temperature, circulation thermal efficiency and output power are calculated. Then, the appropriate component program is selected and the structure and parameters are designed in detail according to the requirements. Finally, kinematics simulation analysis of the scroll expander (the device's core power-output component) for verifying the correctness of its modeling and motion characteristics. The device features a cleverly compact structure, lightweight design, and rational component layout.