The invention relates to an oil sand extraction system, the outlet of an oil sand temporary storage bin is connected with an oil sand inlet of a leaching device through a quantitative packing auger, awet sand outlet of the leaching device is connected with a vertical evaporation machine through a wet sand conveyor, an inlet of a new solvent pump is connected with a fresh solvent pipe, an outlet of the new solvent pump is connected with a new solvent inlet of the leaching device, a concentrated liquid outlet of the leaching device is connected with an inlet of a concentrated extraction liquidextraction pump, an outlet of the concentrated extraction liquid extraction pump is connected with an inlet of a primary cyclone separator through a mixed liquid delivery pipe, a light-phase outlet ofthe primary cyclone separator is connected with an inlet of a secondary cyclone separator, a light-phase outlet of the secondary cyclone separator is connected with an inlet of a solution temporary storage tank, a lower outlet of the solution temporary storage tank is connected with a reflux opening of the solution temporary storage tank and an extraction liquid evaporation recovery system through a temporary storage tank conveying pump, a recycled solvent outlet of the extraction liquid evaporation recovery system is connected with an inlet of the fresh solvent pipe. The system has the advantages that the investment is saved, the extraction efficiency is high, all the powder materials can be utilized, and the economic benefits are greatly improved.