The invention discloses an isolation type oil tank of a dry type iron separation machine. The isolation type oil tank of the dry type iron separation machine comprises an oil tank body. A first oil storage chamber and a second oil storage chamber are arranged in the oil tank body and communicate with each other. A handle is arranged on the top of the oil tank body. The second oil storage chamber is further provided with a filling port. The oil tank body is made of engineering plastic. The capacity of the first oil storage chamber is larger than that of the second oil storage chamber. Since the body of the isolation type oil tank of the dry type iron separation machine is made of the engineering plastic, no explosion is caused by collision in the using process; and the large oil storage chamber and the small oil storage chamber are arranged in the oil tank body, oil cannot oscillate seriously even if vibration is serious, the overall internal oil is kept stable, and therefore the safety of the isolation type oil tank of the dry type iron separation machine is greatly improved.