LDO chip is one of the key topics in the research of integrated circuits. In response to the demands of portable electronic devices for low power consumption, high integration, and environmental sustainability, the low-voltage linear regulator, exemplified by LDO has stood out. It delivers swift transient response with minimal static current, and boasts a high power supply rejection ratio, all while being cost-effective and featuring a relatively straightforward design. However, in the case of high voltage differences, LDO is less efficient and is not suitable for high-power output applications. Therefore, aiming at the low efficiency of LDO under large pressure differences, the research method of this paper is to analyze the basic principle and performance of LDO chips at home and abroad and propose a design scheme of low voltage difference linear regulator with ultra-low power consumption and wide input range, so as to meet the needs of portable equipment, industrial automation, automotive electronics, communication equipment, and other fields.