The invention relates to the field of automotive power, in particular to a generator set for an electric compressor of an automotive air conditioner. The generator set is modified on the basis of the prior art and comprises a generator stator for the electric compressor of the automotive air conditioner, a generator rotor for the electric compressor of the automotive air conditioner, and a generator casing for the electric compressor of the automotive air conditioner. The generator set is located on the lateral side of an automotive engine. A crankshaft of the automotive engine is respectively connected with a drive shaft of the rotor and a drive shaft of a water pump through belts. The drive shaft of the water pump is located at the other end of the engine. The crankshaft of the automotive engine drives the drive shaft of the rotor and the drive shaft of the water pump to rotate. Compared with the prior art, the generator set is material-saving and reasonable in space utilization. In addition, safety is improved, space can be economized, and energy resources can be utilized effectively.