This paper provides a systematic review of how artificial intelligence (AI), especially machine learning (ML), can be applied across the drug discovery pipeline. To address the complexity, high cost, long time, and high failure rate of existing drug discovery methods, a comprehensive understanding of how to effectively integrate AI/ML into the entire process is needed. This paper analyzes the application of AI/ML step by step, considering the interdependencies between key steps such as target identification, hit screening, and lead optimization, and highlights methodological advancements and their impact at each step. In-depth case studies focusing on hyperuricemia, gouty arthritis, and hyperuricemic nephropathy demonstrate practical impacts, and suggest challenges and future research directions for AI/ML in drug discovery. This provides essential guidance for researchers seeking to overcome existing bottlenecks and accelerate drug discovery by leveraging AI/ML.