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China's large supermarket retail industry has entered a mature development stage after a rapid introduction period and growth period. In the fierce competition environment of retail industry in the 4.0 era, consumers are increasingly demanding the service quality of large supermarket retail industry with most updated service especially in digital development. Therefore, how to improve the service quality will become the key factor for the success of large supermarket retailing that strive to diversify their products and services offerings and deliver enriched lifestyle shopping experience. China's retail sector is being redefined by a new wave of technologies to facilitate smart strategy in shopping experience. China supermarket retail market chain in Haikou is facing many severe challenges, such as declining corporate profit margins, high customer turnover rate, low customer loyalty, and tough competition, etc. This requires that the retail trade of supermarket must take the customer's point of view, consider the customer's feelings, and provide products and services that reach and exceed the customer's expectation level. The new strategy should have the customer loyalty be improved. Therefore, it is of great theoretical and practical significance to pay attention to customer loyalty and study the relationship between service quality and customer loyalty in China's supermarket retail industry. This article analyses the gap between the customer perceived value and expected value of consumers in five dimensions of tangibility, reliability, responsiveness, assurance and empathy, providing promotion strategies for improving the perceived value of customer service quality in the retail industry 4.0 era. This study also provides empirical evidence on factors influencing consumers' convenience shopping of supermarket service in Haikou of China.