Single-side crushing and pre-crushing type double-roller sand making machine

The utility model relates to a single-side crashing pre-crushing type double-roller sand making machine which comprises two rolling cylinders arranged in a shell, a rolling gap is formed between the two rolling cylinders, the shell is provided with a discharging port and a feeding port, the feeding port is located above the rolling cylinders so that stones to be rolled can be input between the two rolling cylinders, and the feeding port is provided with a sieve; an extrusion head sliding hole is formed in one of two opposite side walls of the feeding hole, and a cutting board is arranged on the other side wall; an extrusion crushing head is slidably connected in the extrusion head sliding hole, the extrusion crushing head is located above the screen, the extrusion crushing head is connected with a hydraulic oil cylinder, and the hydraulic oil cylinder is connected with a hydraulic station; and when the extrusion crushing head is folded towards the chopping board to a limit position, the gap between the extrus