The invention discloses a closed circulating system for pulping and papermaking white water. The closed circulating system for pulping and papermaking white water comprises a paper machine, a paper machine clear water supplementing pond, a multi-plate concentrator, a cloudy white water scummer and a filtrate white water pond, wherein a cloudy white water pond is arranged below a forming net of the paper machine; the filtrate white water pond communicates with the cloudy white water pond and supplements filtrate white water for the cloudy white water scummer; a water inlet of the cloudy white water scummer communicates with an overflow opening of the cloudy white water pond; an overflow opening of the cloudy white water scummer communicates with an outdoor cloudy white water pond; a first water tube is arranged on the outdoor cloudy white water pond; a cloudy white water outlet of the multi-plate concentrator communicates with a water inlet of the cloudy white water scummer; a filtrate white water outlet of the multi-plate concentrator communicates with a water inlet of the filtrate white water pond; and an overflow opening of the filtrate white water pond communicates with an outdoor filtrate white water pond. Filtrate white water produced by the multi-plate concentrator is secondarily filtered through a gravity filter, and then is further classified and utilized, and therefore, closed circulation of the pulping and papermaking white water, namely zero emission of the white water, is realized.