The utility model discloses a miniature simulation system for lightning stroke electrical aging of insulated overhead conductors and belongs to the field of testing. The miniature simulation system comprises a group of three-phase line insulated supports, a high-voltage pulse generator, a console and an oscilloscope, wherein an A-phase insulated overhead conductor, a B-phase insulated overhead conductor and a C-phase insulated overhead conductor are respectively arranged on the group of three-phase line insulated supports, and the A-phase insulated overhead conductor, the B-phase insulated overhead conductor and the C-phase insulated overhead conductor are fixedly connected with the group of three-phase line insulated supports through supporting insulators respectively; a high-voltage pulse output end of the high-voltage pulse generator is connected with wire cores of the A-phase insulated overhead conductor, the B-phase insulated overhead conductor and the C-phase insulated overhead conductor; the console is used for controlling high-voltage pulse output; the oscilloscope is used for monitoring high-voltage pulse output by the high-voltage pulse generator; and the console is connected with the oscilloscope. By the miniature simulation system, actual phenomena of the insulated overhead conductors in states of humidity erosion, lightning stroke electrical aging and the like can be truly reflected, whether insulated structures of insulated overhead conductors put into operation is rational is verified, and the experiment research cost can be reduced; and the miniature simulation system can be widely applied to fields of designing, mounting and running of the insulated overhead conductors.