The invention provides a digital-to-analog converter, and is used to convert input digital signals into analog signals. The digital-to-analog converter comprises a first-level resistor string structure, a decoder, a first single voltage selector, a second single voltage selector, a second-level resistor string structure and a third single voltage selector at least; the first-level resistor string structure comprises first-level resistors and switches in serial connection at least, and the first-level resistors and the switches are arranged separately; the decoder is connected with the first-level resistor string structure; the first single voltage selector is connected with the first-level resistor string structure; the second single voltage selector is connected with the first-level resistor string structure; the second-level resistor string structure is connected with the first single voltage selector and the second single voltage selector, and comprises second-level resistors in serial connection; and the third single voltage selector is connected with the second-level resistors in serial connection. The digital-to-analog converter is simple in structure, low in power consumption, small in area and high in precision; and compared with the prior art, the area and power consumption are reduced, and errors are reduced greatly.