The blind box, with its uncertain probability of drawing high-value hidden items, exhibits characteristics of decision-making under ambiguity. This study found that: (1) when the probability of drawing a hidden item is ambiguous, adolescents are more likely to choose the blind box option compared to when the probability is known, though this preference difference only emerges when the probability of drawing a hidden item is very low; (2) after sampling experiences with ambiguous probabilities of obtaining hidden items, adolescents’ preference for blind boxes with extremely low probability significantly decreases. From the perspective of decision-making under ambiguity, this research provides insights into reducing adolescents' preference for ambiguity.