The invention relates to a food and kitchen waste complete-screening pulping system and a pulping technique. The food and kitchen waste complete-screening pulping system comprises a kitchen waste collection device, a food waste collection device, a kitchen waste collection hopper, a food waste collection hopper, a kitchen waste elevator, a food waste elevator, a crusher, a cleaning machine, a food and kitchen material elevator, a pulping machine, a biochemical unit tank, a slag discharging hopper, a waste material conveyor, a grease separator, a pulp filter and a grease filter. According to the pulping technique, kitchen waste and food waste are pretreated through the pulping system. The food and kitchen waste complete-screening pulping system and the pulping technique are suitable for complete-screening pulping of food and kitchen waste large in collection and transportation quantity, the treatment efficiency is high, and the failure rate of equipment is decreased.