The invention discloses a successive approximation type digital-analogue converter comprising a first signal input terminal, a second signal input terminal, a first capacitor array, a second capacitorarray, a comparator, a logic chip and an output latch. The signal input terminal connected to the first capacitor array is used for inputting a first signal to the first capacitor array; the second signal input terminal connected to the second capacitor array is used for inputting a second signal to the second capacitor array; the first capacitor array is connected to a non-inverting input terminal of the comparator; the second capacitor array is connected with an inverted input terminal of the comparator; and the comparator with the output terminal connected with the logic chip and the output latch successively is used for comprising the first signal with the second signal and outputting a comparison result. A first switch is arranged between the first capacitor array and the second signal input terminal; and a second switch is arranged between the second capacitor array and the first signal input terminal. Compared with the traditional capacitor array, the successive approximation type digital-analogue converter enables the area to be reduced and zero voltage switching power consumption to be realized.