The invention discloses a 750 kV wine glass composite cross arm tower. The 750 kV wine glass composite cross arm tower comprises two sets of side phase composite material cross arms, one set of middle phase composite material cross arms, one set of steel structure tower windows, two sets of steel structure ground wire supports and one set of steel structure tower bodies. The bottoms of the tower windows are fixed to the tops of the steel structure tower bodies. The two sets of side phase composite material cross arms are arranged on the two sides of the middles of the tower windows. The two sets of steel structure ground wire supports are arranged on the two sides of the tops of the tower windows. The middle phase composite material cross arms are arranged in the tower windows. The steel structure ground wire supports are connected with ground wires and angle steel of the tower windows. The angle steel of the tower windows are connected with tower body steel structures, ground connection downward leading is achieved, and the thunder prevention purpose is achieved. The purpose of tower head insulation is achieved by ensuring the effect that all the distances from wire hanging points to any metal piece meet the requirement of the insulation distance. All components form a space truss system so as to transmit loads. The creep distance of the cross arms is increased through umbrella skirts on the surfaces of the composite material components. Electric field distribution is improved through a grading and shielding ring.