The invention relates to an environment-friendly diesel generating set and belongs to the technical field of generating sets. The environment-friendly diesel generating set comprises a muting tank, an exhaust reuse device and a generating set body. The generating set body is arranged in a cavity of the muting tank. The exhaust reuse device is communicated with a generating set engine exhausting pipe. Muting cotton is bonded to the inner wall of the muting tank. A specific formula and a manufacturing process are adopted for the muting cotton. By the adoption of the technical scheme, the generating set is good in environment-friendly effect, and the amount of hazardous substances contained waste gas exhausted by the generating set is lower than 0.01%; the muting effect is good, and the average value of the noise pressure of the portion 1 m away from the generating set is 21 decibels; the flame resistance of a tank body is good, the flame resistance level is high, and the generating set is guaranteed effectively; and the impact strength of the tank body is high, the yield strength of the tank body of the muting tank reaches 236 MPa, and tensile strength reaches 367 MPa.