Switching control method of high-low sulfur oil switching device and high-low sulfur oil switching device

The invention provides a switching control method of a high-low sulfur oil switching device and the high-low sulfur oil switching device. The high-low sulfur oil switching device comprises fuel oil switching equipment and temperature adjusting equipment, and the switching control method comprises the following steps that S1, the high-low sulfur oil switching device operates in a first working mode; S2, whether the high-low sulfur oil switching device needs to be switched from the first working mode to a second working mode or not is judged, if so, a first switching mode is started, and if not,the device returns to S1; S3, in the first switching mode, the fuel oil switching device works, the temperature adjusting equipment is controlled according to the fuel oil inlet temperature or the fuel oil inlet viscosity, the change speed of the fuel oil inlet temperature and the fuel oil inlet viscosity are enabled to be within a preset range, and when the fuel oil inlet temperature and the fuel oil inlet viscosity mee