The invention relates to a method for efficiently degumming hemp by means of peroxidating at the low temperatures under low-emission conditions. The method includes mixing alkali metal peroxide, amide substances and water with one another to obtain degumming treating fluid; carrying out degumming treatment on to-be-degummed hemp materials by the aid of the degumming treating fluid in wetting, padding or spraying modes under certain treatment conditions; carrying out first-pass cleaning on materials obtained by means of degumming treatment by the aid of the treating fluid in environments at the temperatures ranging from 5 DEG C to -20 DEG C, then cleaning the materials until the materials are neutral and drying the materials. The treatment conditions include that the to-be-degummed hemp materials are treated by 1-10 passes under the conditions of the temperatures ranging from 5 DEG C to -80 DEG C and are treated for 10s-30s in each pass. The method has the advantages that the method is high in efficiency and includes simple processes; the treating fluid can be reused, accordingly, the method is low in energy consumption, water consumption, production cost and sewage discharge, degumming byproducts can be timely collected, and transformation of the hemp spinning industry to the low-carbon environment-friendly industry can be promoted.