Abstract: In order to explore the effect of magnetic treatment technology on the viscosity reduction of waxy crude oil, the influencing effect of magnetic field intensity, magnetic treatment temperature and magnetic treatment time on the viscosity reduction of waxy crude oil was investigated using an independently developed static magnetic treatment device. Then, the wax crystal structure of waxy crude oil before and after magnetic treatment was observed by polarizing microscope and the reasons for the viscosity reduction of waxy crude oil by magnetic treatment were analyzed. The test results of static magnetic treatment show that the best magnetic treatment conditions include the magnetic field intensity of 100 mT, the magnetic treatment temperature of 49 ℃ and the magnetic treatment time of 10 min and the factors influencing magnetic treatment effect are ranked from the top to the bottom as magnetic treatment temperature, magnetic treatment intensity and magnetic treatment time. Microscopic observation test reveals that the magnetic field promotes the accumulation of small wax crystal particles, which increases the number of large wax crystal particles and the flow section area of liquid hydrocarbon, so as to reduce the viscosity of waxy crude oil and improve the fluidity of waxy crude oil.