A multiple combined-cycle power device relating to the field of energy and power technology. A condenser (8) connects to a mixing evaporator (9) through a circulator pump (5). An expander (2) connects to the mixing evaporator (9) through a medium-temperature evaporator (10) by means of a steam channel. The mixing evaporator (9) connects to a compressor (1) and a third expander (4) separately by means of steam channels. The compressor (1) connects to the expander (2) through a high-temperature heat exchanger (7) by means of a steam channel. The third expander (4) connects to the condenser (8) by means of a steam channel. The condenser (8) connects to itself through a second circulator pump (6), the medium-temperature evaporator (10) and a second expander (3). A second compressor (11), a combustion chamber (15) and a fourth expander (12) constitutes a gas turbine circulation system. The fourth expander (12) connects to the outside of the device through the high-temperature heat exchanger (7) by means of a gas channel. The condenser (8) connects to the outside of the device by means of a cooling medium channel. The expander (2) connects to the compressor (1) and outputs power. The fourth expander (12) connects to the second compressor (11) and outputs power. The expander (2), the second expander (3), the third expander (4) and the fourth expander (12) connect to the outside of the device and output power, and form a multiple combined-cycle power device. The device preserves the advantages of a steam power cycle, overcomes the weaknesses thereof and effectively increases thermal efficiency.