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Abstract: The printed circuit board (PCB) stands as the cornerstone of electronic equipment, with its schematic holding paramount importance for system performance and reliability. In light of the pervasive use of electronic devices in society, concerns regarding maintenance, safety, backdoors, and other latent issues have garnered significant attention. automatic schematic generation (ASG), with its distinct capability for generating circuit schematics autonomously, not only plays a pivotal role in Electronic Design automation (EDA) but also aids in deciphering the fundamental principles of PCB equipment to effectively address these underlying issues. However, constrained by the increasingly sophisticated manufacturing processes of PCBs and the inherent legal and ethical controversies surrounding reverse engineering, the development of related technologies faces notable bottlenecks. To break through technical barriers and advance technological progress, this paper comprehensively combs through the existing ASG, in-depth description of the core algorithms of the technology � layout and routing, and for the application of the technology in PCB reverse engineering, analyzes in detail the current challenges and problems faced. Around these challenges, feasible solutions are discussed in this paper, with the aim of promoting the research of automatic PCB schematic generation technology and contributing new strength to EDA and PCB reverse engineering automation.