The invention relates to a 66kV line composite insulator clamping and supporting bottle rack and an insulator replacing method. The 66kV line composite insulator clamping and supporting bottle rack comprises supporting pipes, a wing-shaped front clamp, a lead screw, a wing-shaped rear clamp, a pull plate, adjusting plates and a bolt, wherein an adjusting hole is formed in one end of the pull plate, the other end of the pull plate is connected with the lead screw, the wing-shaped front clamp is connected with the pull plate through the adjusting hole, the other end of the lead screw is connected with the wing-shaped rear clamp, the end portion of the wing-shaped rear clamp is connected with the bolt, the adjusting plates are fixed to the wing-shaped rear clamp and the pull plate, arc-shaped holes are formed in the adjusting plates, and the supporting pipes are fixed to the adjusting plates through fasteners. The 66kV line composite insulator clamping and supporting bottle rack has the advantages that the bottle rack is small in size and convenient to operate, time and labors are saved during insulator replacement, and replacing efficiency is greatly improved. An insulator can be replaced as required at any time when the insulator is damaged, and accidental trip caused by non-timely replacement is avoided. Power supply reliability and power sale quantity are greatly improved, and social contradictions caused by temporary electricity interruption are further decreased.