According to the engineering education certification and the reform and exploration of structural mechanics course of water conservancy and civil engineering specialty in agricultural colleges and universities under the background of emerging engineering education, combining with the preliminary application practice of intelligent teaching tool of rain classroom in the course teaching through presenting preview materials and prestigious school video, in-class PPT synchronous learning and classroom testing, after-class pushing homework and communication and feedback between teachers and students help teachers to teach accurately. Practice results show that the scores of the first final exam of hydraulic engineering specialty in the past two years have been significantly improved compared with the traditional teaching mode. The rain classroom has achieved certain results in the mixed teaching of structural mechanics. So the paper explores how to combine rain classroom teaching with the learning characteristics of engineering students in agricultural colleges aiming at students' learning benefits, and provide reference for the teaching reform of relevant mechanics courses in the era of big data.