The invention relates to a pressurizing heating oil gas mixing transportation system and method. The system comprises an in-station valve group, a fuel gas separator, an oil gas mixing transportation pump, a pipe type heating furnace and a long-distance oil gas mixing transportation pipe which are sequentially communicated through a pipe. A multi-phase shock excitation sand remover, a multi-phase mixing transportation pump group inlet uniform flow device and a gas liquid separation flow divider. Gas and liquid mixture from an oil field well area enters the pipe type fuel gas separator, a part of natural gas is separated to serve as fuel of the heating furnace, surplus gas liquid mixture enters the multi-phase shock excitation sand remover to be subjected to sand removing, enters the multi-phase mixing transportation pump group inlet uniform flow device to be subjected to uniform flow distribution and is delivered to the gas liquid separation flow divider through the oil gas mixing transportation pump, and the separated liquid enters the pipe type heating furnace to be heated and is mixed with the separated gas to enter the long-distance oil gas mixing transportation pipe. Safe stable high-efficiency operation of the system is guaranteed, service life of devices is prolonged, and project investment, energy consumption, operation maintenance and operation cost are reduced.