The invention provides an integrated device capable of achieving expansion power generation and compression refrigeration through natural gas pressure. The integrated device comprises a monitoring and regulating control system, an expansion power generation system and a refrigerant refrigerating system. Integration of power generation and refrigeration is achieved through the expansion power generation system and the refrigerant refrigerating system. Stability of a power generation set is guaranteed through the monitoring and regulating control system, the problem that the load power change is large is effectively solved, the refrigerant compression amount is fast adjusted according to the load changing speed, and therefore the power of a whole load system is matched with the power generating amount, and continuous and stable running of the power generation set is guaranteed. The integrated device can achieve electric power balance and is high in system efficiency and high in broad spectrum performance, cooling capacity is used for making ice, and therefore industrial ice or food ice can be obtained while electric power is obtained.