Energy-saving and environment-friendly screening device for constructional engineering construction building material gravel

The invention discloses an energy-saving and environment-friendly screening device for constructional engineering construction building material gravel. An upper rail and a lower rail with the same structure are arranged in the machine body; a first material passing screen is borne on the upper rail and the lower rail, and a second material passing screen is borne on the two lower rails. An inclined panel with a material leaking hole is arranged in the middle of the first material passing sieve; an outflow square hole is formed in the right side of the first material passing sieve; sliding plates inclining towards the inner side of the middle part are arranged on the left and right sides of the bottom of the first material passing screen; a driving support is installed on the left side ofthe first material passing screen, a linkage rod and a driving motor are arranged in the driving chamber, the linkage rod is connected with a driving disc through a power rod, the power rod is hingedto the midpoint of the lin