The invention provides a time frequency measuring circuit of broadband frequency hopping signals. The time frequency measuring circuit includes a power distribution unit, a peak power detection unit, a power adjustment unit, a broadband frequency division unit, a dead zone-free counting unit, a frequency calculation unit and a display unit. With the time frequency measuring circuit of the broadband frequency hopping signals of the invention adopted, relationships of the changing of the frequency of the broadband frequency hopping signals with time can be measured fast. The time frequency measuring circuit is used for measuring frequency hopping dwell time, frequency hopping patterns and the like. According to time frequency measuring circuit of the invention, a broadband frequency division measurement method is adopted, and therefore, measurement frequency can be decreased, and at the same time, frequency measurement bandwidth loss can be avoided, and therefore, the time frequency measuring circuit and method are economical and affordable, and the cost of the method is only 1/5 or less than that of a method adopting an oscilloscope.