The invention relates to a trunk line electrification contact system in a strong wind environment and a parameter determination method thereof. A strong wind effect on a wind area and a wind gap enables a contact system to generate a high and complicated vibration and windage yaw, dynamic quality of a pantograph-catenary operation is affected, and pantograph-catenary contact safety and contact system structure safety are threatened. According to the trunk line electrification contact system in the strong wind environment and the parameter determination method thereof, a computational fluid dynamics (CFD) numerical analog computation, a contact system wind-induced response finite-element analysis, a pantograph-catenary simulation, a wind tunnel test and a field engineering test are comprehensively utilized to propose the contact system which is comprehensively excellent in structural strength, rigidity, reliability, wind resistance stability and pantograph-catenary dynamic current collection performance, namely, a simple catenary suspension system is utilized, according to the simple catenary suspension system, a structural height is 1100mm, a span is less than 50m, tensile force of a carrier cable is matched with that of a contact line, the whole suspension system is in a steel cantilever structure, a transformation column and a turnout column are double-cantilever columns, and the contact line and the carrier cable achieve column branch anchoraging. Besides, the contact system which can adapt to the strong wind condition is provided, so that the safe reliability of the contact system structure under the action of long-term strong wind can be guaranteed.