With the background of engineering education certification and new engineering background, the reform and exploration of structural mechanics course of water conservancy and civil engineering specialty in agricultural colleges and universities. Combining with the preliminary application practice of intelligent teaching tool 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, etc. These can help teachers to teach accurately. Practical 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 those of the traditional teaching mode, which shows that the rain classroom has achieved certain results in the mixed teaching of structural mechanics. Although there are still some drawbacks in the teaching of structural mechanics in rainy classroom at present, through gradual improvement in teaching in the future, teachers should ultimately explore how to combine rainy classroom teaching with the learning characteristics of engineering students in agricultural colleges, aiming at students" learning benefits. This kind of wisdom teaching in the era of big data can provide reference for the teaching reform of relevant mechanics courses.