The invention relates to the field of transformer processing and production, and particularly relates to an automatic winding device of a transformer. The automatic winding device comprises a windingassembly, a cable, a cable conveying assembly, an automatic winding assembly, an insulation paper winding assembly, a cutting assembly, insulation paper, an insulation paper conveying assembly and a paper winding assembly which are arranged in sequence, wherein the cable conveying assembly comprises a first horizontal displacement mechanism, a clamping mechanism and a first rotary driving motor, the clamping mechanism comprises a rotary pressing wheel and a pressing plate capable of ascending and descending, the automatic winding assembly comprises a rotatable main shaft, the insulation paperconveying assembly comprises two transmission rollers capable of rotating, and the insulation paper winding assembly includes a paper pressing plate capable of vertical ascending and descending and aglue spray nozzle capable of applying glue. According to the automatic winding device, the labor intensity of workers can be greatly reduced, the working efficiency is improved, potential safety hazards existing in the manual operation process are reduced, and the automatic winding device is suitable for large-batch rapid production and processing.