The invention discloses a method for generating power and making ice by the aid of pressure energy of natural gas of a pipe network and a device. The method includes steps of (1), throttling the high-pressure natural gas by a throttling valve and expanding the high-pressure natural gas by an expansion machine to generate electric power; (2), realizing heat exchange between the expanded natural gas and refrigerant in a first heat exchanger 4, further realizing heat exchange between the natural gas and refrigerant of a second heat exchanger 5, leading the temperature of the natural gas to rise to a range from 2 DEG C to 10 DEG C after heat exchange processes, and delivering the natural gas into the urban gas pipe network; and (3), delivering one channel of the refrigerant in the second heatexchanger 5 into a refrigerant channel of the first heat exchanger after the heat exchange process, compressing another channel of the refrigerant by a compressor, cooling the other channel of the refrigerant by circulating cooling water, throttling and expanding the other channel of the refrigerant, and then delivering the other channel of the refrigerant and the refrigerant in the first heat exchanger after the heat exchange process together to an ice maker 11 to make ice. The method and the device have the advantages that fuel for heating low-temperature natural gas after pressure of the low-temperature natural gas is regulated is saved, operating cost of a natural gas pressure regulating station is greatly lowered, the electric power is obtained, and simultaneously, a large quantity of industrial or edible ice can be produced.