In recent years, biological control has become one of the important means of insect pest control in Chinese urban gardens with the urban residents' increasingly high requirements for the living environment and from the perspective of ecological environmental protection. Biological control is a method that utilizes beneficial organisms or their metabolic products to prevent and control pests and diseases. It has advantages such as being safe for humans and other organisms, pests being less likely to develop drug resistance, and having a lasting control effect. It holds a pivotal position in urban pest management. In this paper, biological control methods of urban garden pests, application examples, existing problems and solutions of biological control of urban garden pests in Beijing were systematically reviewed. Firstly, presenting a comprehensive review of important biological control technologies such as controlling pests with insects, controlling pests with fungi, and controlling pests with birds is helpful for further understanding the key technical points of biological control and its significant importance for the protection of biodiversity. Secondly, by combining the successful cases of biological control of pests in Beijing's urban gardens, deeply analyzing the important position of biological control technologies in the prevention and control of pests in urban gardens is of great significance for realizing the grand goals of the capital city's biodiversity and promoting the construction of a garden city in the capital. Finally, in light of the problems encountered in the practical application of biological control technologies, approaches and lines of thought for problem-solving have been put forward. Briefly speaking, this review holds substantial theoretical and practical significance in guiding the biological control of pests in urban gardens, which is conducive to enhancing urban biodiversity and the quality of the living environment for urban residents.