The invention discloses a salt corrosion resistance detection method of portland blast furnace-slag cement. The method comprises the following steps: splashing 70 wt% of a sodium chloride solution onto cement to be detected every 4-6 hours, blow-drying at the air speed of 20-30 km/h, repeating the above steps for 8-12 days, and counting number of cement patches. The invention has beneficial effects: the salt corrosion resistance detection method of portland blast furnace-slag cement has advantages of simple operation process and high accuracy, and completely simulates corrosion condition of cement in a natural environment; it is verified that similarity rate between the corrosion effect of the method and the corrosion effect of concrete in a natural environment reaches 80% or above; and the method can be used as a corrosion detection standard of cement.