The invention relates to a production technique and device of directly edible syrup. The method comprises the following steps: pressing sugar cane with a juice press to obtain a sugar cane juice; prefiltering the sugar cane juice through a coarse filter, and filtering with a microfiltration membrane to obtain a sucrose juice clear solution; concentrating the sucrose juice clear solution through a nanofiltration membrane to obtain a concentrated solution; sending the concentrated solution into a first ion exchange resin tower to obtain a first permeation solution; sending the first permeation solution into a second ion exchange resin tower to obtain a second permeation solution; and concentrating the second permeation solution in an evaporator to obtain a refined concentrated solution, adding additives and uniformly mixing to obtain the syrup. The product produced by the production technique provided by the invention has the advantages of low chromatic value, high desalting rate and high yield.