With the development of industry, modern numerical control productions require low ripple, wide adjustment range power supply, especially in high energy physics. In order to solve the difficulties such as low numerical control level, low power density and poor reliability, a novel number control power supply was proposed. First, the AT89S52 was adopted as core control chip to carry out the function of number controls stabilized power supply. Second, DA converter TLC5615, three-adjustable regulators LM317 and OP07 were utilized to constitute regulator source. Third, LCD1602 was adopted to display output voltage value. This power supply can output voltage from +1.5V to +20 V, and step voltage is 0.1V, it has high precision and stability and has the biggest ripple of 100 mV. Compared with traditional stabilized power supply, this power supply has the characteristics of simple operation, high stability.