Preparation method and system device of nitrous oxide

The invention provides a preparation method and system device of nitrous oxide. The system device comprises a raw material storage unit, a reaction unit, a filter unit, a condensation unit, a washing unit, a compression unit, a cooling unit and a product storage unit, the filtering unit comprises a gas filter; the gas filter comprises an inner cylinder and an outer cylinder which are coaxially arranged; a filter body is arranged on the outer wall of the inner cylinder; a first gas pipe is arranged at the top of the inner cylinder, and a second gas pipe is arranged at the bottom end of the side wall of the outer cylinder; a liquid pipe is arranged at the bottom of the inner cylinder; a spraying pipe is inserted in the side wall of the outer barrel in the radial direction, and an outlet of the spraying pipe faces the inner barrel; according to the system device, the whole production process is optimized, the structure of the filtering unit is further improved, the occupied area of equipment is reduced, the wate