Abstract: The heating method for reducing the viscosity of crude oil is mainly electric heating currently. However, all-day electric heating has the problem of high energy consumption and high cost. To meet the needs of environmental protection and industrial production, a new type of phase change storage thermoelectric heating device is designed by combining the crude oil viscosity reduction heating method with grain electricity and phase change materials. Then, the performance of phase change storage heat release of the device is studied by numerical simulation, and the influence of different inlet flow rate and the porosity of metal foam on the heat release process is analyzed. The results show that the outlet temperature decreases with the increase of inlet flow. At the same time, the addition of nickel foam makes the internal temperature of phase change materials more uniform, and the internal temperature of phase change materials decreases with the decrease of the porosity of metal foam. This paper adopts the method of increasing the number of electric heating rods and reducing the power of a single electric heating rod to optimize the structure of the device, and the local high temperature phenomenon is obviously improved after optimization. This device can not only maintain high heat transfer efficiency, but also reduce the production cost.