The English reading motivation of vocational college students serves as the core driver for their active participation in reading learning and gradual improvement of reading proficiency. The dynamic evaluation mechanism, with its key advantages of real-time tracking, precise feedback on learning outcomes, and dynamic adjustment of teaching arrangements, provides scientific support for the deep integration of adaptive learning and vocational English reading instruction. While it can positively activate students’ reading motivation, improper application methods may lead to a weakening of motivation. Based on the actual learning conditions of vocational college students and the inherent compatibility between dynamic evaluation and adaptive learning, this paper first systematically analyzes the dual impact of adaptive learning under dynamic evaluation mechanisms on vocational English reading motivation. Then, with the core objectives of stimulating and sustainably maintaining reading motivation, it proposes practical optimization strategies from five dimensions: evaluation system optimization, content adaptation, training model innovation, feedback mechanism improvement, and support system construction. This study aims to provide practical references for vocational English teachers to enhance teaching effectiveness through the integration of dynamic evaluation and adaptive learning, facilitating the transformation of vocational English reading instruction toward precision and personalization.