The invention discloses a novel three-rotor gas turbine. Through changing the blade profile of a turbine guide blade and the mounting angle of each of the guide blade and a moving blade, when air current flows through a high-pressure turbine, a high-pressure rotor rotates along one direction, the air current turns by a small angle after flowing through a low-pressure turbine guide blade, a low-pressure turbine rotor rotates along the other direction, a power turbine is an independent rotor, the power turbine rotor rotates along the same direction with the high-pressure rotor, the rotating direction of the high-pressure rotor is opposite to the rotating direction of the lower-pressure rotor, and the rotating direction of the high-pressure rotor is the same with the rotating direction of the power turbine rotor. By means of said technical scheme, the novel three-rotor counter-rotating turbine gas turbine is realized, through reducing the number of low-pressure turbine guide blade, power turbine guide blade, low-pressure compressor outlet guide blade and high-pressure compressor inlet guide blade, the pressure loss between the low-pressure turbine guide blade stages can be reduced, the air amount for cooling turbines is reduced, and the equipment weight and resultant moment on a casing are reduced.