The invention relates to a mounting bracket for a power generator in a mixed connection type hybrid power system. The mounting bracket comprises a motor support for being connected with the power generator; an upper end face of the motor support is an inclined plane; an inclination angle of the inclined plane is consistent with that of an engine; an adjusting mechanism for adjusting a tensioning degree of a belt is arranged on the motor support. According to the technical scheme, the inclined plane of which the inclination angle is consistent with that of the engine is arranged on the motor support, so that a belt wheel of the power generator and a belt wheel of the engine are enabled to be positioned in the same plane; meanwhile, the tensioning degree of the belt can be adjusted by the adjusting mechanism arranged on the motor support; the mounting bracket is simple in integral structure and convenient to use.