The utility model relates to a comprehensive fatigue test system of stretching vibration and torsion of a composite insulator. The system comprises a coupling mechanism, a tension sensor, a static and dynamic load joint loading mechanism, a cooling system and a torsion loading mechanism, which are orderly connected to each other end to end; the tension sensor, the static and dynamic load joint loading mechanism, the cooling system and the torsion loading mechanism are respectively connected to a measurement and control system; the static and dynamic load joint loading mechanism and the torsion loading mechanism are respectively connected to a base. According to the comprehensive fatigue test system of stretching vibration and torsion of the composite insulator provided by the utility model, the static tension and the dynamic tension with adjustable frequency are applied to one end of the composite insulator along the axial direction through the measurement and control system, and the torsion tension with adjustable frequency is applied to the other end of the composite insulator, which establishes the test condition for the fatigue property research of the composite insulator under the combined effect of the static load, the dynamic stretching vibration load and the torsion load.