A digital-to-analog conversion device and method are provided. The control module is configured to split the input digital signal into n intermediate digital portions, divide the n intermediate digital portions by the corresponding conversion coefficients to obtain n intermediate digital signals and transmit the n intermediate digital signals to the n conversion modules. The n intermediate digital portions increase progressively. The conversion module is configured to perform digital-to-analog conversion on an intermediate digital signal to obtain a result including the conversion coefficient of the conversion module. The adder is configured to add output signals of the n conversion modules to obtain an analog signal. The feedback module is configured to obtain a feedback signal according to the analog signal. The control module is further configured to adjust the allocation of the n intermediate digital portions according to a target digital signal and the feedback signal.