The invention provides a spectrum feature visualization device and a spectrum feature visualization method, used for displaying time occupancy rates and space occupancy rates of comprehensive frequency and different industrial utilization frequency, and a maximum value, a minimum value and an average value of level/field intensity from different angles such as frequency domain, space and time by using charts. Measurement on the spectrum occupancy rate is performed by using a Poisson distribution mathematical model, the situation that the measured spectrum occupancy rate has a reasonable confidence interval can be ensured, furthermore, in the case of same confidence level and relative accuracy, the quantity of sampling points is much less than that of the sampling points in the prior art, particularly under the condition of high occupancy.