Financial constraint refers to the feeling that an individual feels when their financial situation limits their desire to consume. As an important research field, financial constraint has attracted widespread academic attention. This article provides a review of the concept, impact mechanism, and impact on individuals of financial constraint. Firstly, we introduced the definition and connotation of financial constraint, and explained its importance in enterprise decision‐making and economic development. Then, we discussed the impact mechanism of financial constraints. Next, we explored the impact of financial constraints on individual non consumption and consumption levels and summarized the main findings of relevant research. Finally, we have provided prospects for future research directions and emphasized the potential value and importance of studying financial constraints.