The invention puts forward a sufficient entropy digital physical noise device, which comprises a first oscillator, a second oscillator, a first single edge counter, a second single edge counter, a sampling control unit, a counting result conservator, an entropy estimation circuit, a judgment module and a random digit storage module. Through the entropy estimation circuit, an internal entropy valuechange is monitored during the operation period of a noise source; the oscillators of two same structures are adopted to eliminate an influence of deterministic interference on a counting result andsolve the output certainty problem of the noise source; and in a sampling process, a single edge counting method is used, and the problem of poor output balance of the noise source due to an uneven duty ratio in the period of a sampled signal is solved. By use of the device, the random digit output by the noise source can be guaranteed to own a sufficient entropy property.