The invention discloses a passenger car high-speed rail express system for solving the world problem of urban traffic congestion. According to the technical scheme, the passenger car high-speed rail express system is characterized by comprising a double-layer high-speed train for rapidly conveying passenger cars, a double-layer high-speed rail platform and a passenger car high-speed rail express exclusive information integration and control system, and the passenger car high-speed rail express system for solving the world problem of urban traffic congestion comprises a passenger car high-speed rail express system body for two-way travelling, a passenger car high-speed rail express system body for longitudinal and transverse three-dimensional intercrossing type two-way travelling, a passenger car high-speed rail express system body for annular two-way travelling and a passenger car high-speed rail express system body for combined intercrossing type two-way travelling of the longitudinal and transverse three-dimensional intercrossing type passenger car high-speed rail express system body and the annular passenger car high-speed rail express system body. The passenger car high-speed rail express system is particularly suitable for creating a city passenger car high-speed rail express network in a big city, and also suitable for complete integration networking of national trunk line high-speed rail networks, intercity high-speed rail networks of all provinces and passenger car high-speed rail express networks of all cities.