The invention relates to an oil gas recovering system and method for a refinery plant area oil product loading and unloading platform. The oil gas recovering system comprises an absorbing device, a dewatering device, a condensing device, an adsorbing device and an oil conveying device which are connected through pipelines in sequence. The absorbing device is an absorbing tower, and the dewateringdevice is constituted by a precooler and a solid base column which communicate in sequence. The condensing device is constituted by a condenser and a corresponding refrigerating machine. The adsorbingdevice is an adsorbing tower. Volatilized oil gas is treated synergistically through a gasoline hydrogenation device and a gasometer recovering device of a refinery plant sufficiently, and the outletproblem of desorption resurgent gas is solved; and dewatering is conducted jointly through condensing of the precooler and adsorption of the solid base column, the problem that an oil gas recoveringdevice cannot continuously and stably operate due to frosting ice blockage is solved, thus it is ensured that the device can continuously and stably operate and discharge in an ultra-low standardizedmode, and organic waste gas resource high-value utilization is achieved.