The invention discloses a hygrophilous
plant growing box and a hygrophilous
plant root system moisture preservation method. The hygrophilous
plant growing box comprises a box body, a
honeycomb type
moisture-preserving isolating plate and a water injection tube, wherein the box body comprises a side plate and a bottom plate, the interior of the bottom plate is provided with a
water storage recess,a plurality of isolating through holes are formed at intervals in the
honeycomb type
moisture-preserving isolating plate, the
honeycomb type moisture-preserving isolating plate is arranged over the
water storage recess, a
water storage layer is arranged between the honeycomb type moisture-preserving isolating plate and the water storage recess, a
compost layer is arranged upon the honeycomb type moisture-preserving isolating plate, the water injection tube is a hollow tube, both ends of which are open, the upper end of the water injection tube extends out of the
compost layer, and the lower end of the water injection tube passes through the honeycomb type moisture-preserving isolating plate and extends into the water storage layer. The hygrophilous plant growing box disclosed by the invention is provided with a hygrophilous
plant root system water supply path and a drainage path, the
water supply path and the drainage path form a good
moisture supply and drainage
system, keeping
high humidity around a
root system and supplying moisture to the growth of the
plant root system, and thereby the vigorous growth of branches and leaves is ensured.