The invention discloses a method for removing cadmium and ferrum from crude antimony by using metaphosphoric acid. The method is carried out according to the following steps that: the metaphosphoric acid is added into a metallurgical furnace containing crude antimony liquid, and the furnace is continuously heated to melt the metaphosphoric acid, so that the metaphosphoric acid can cover on the surface of the antimony liquid; then, a blowing pipe is inserted into the antimony liquid to blow, the cadmium in the antimony liquid is oxidized into cadmium oxide, the temperature of the furnace is maintained, the continuous blowing is carried out, the cadmium oxide and the ferrum in the antimony liquid react with the metaphosphoric acid covering on the surface of the antimony liquid to produce cadmium metaphophate and ferrum metaphophate respectively, and the cadmium metaphophate and the ferrum metaphophate scarify with the metaphosphoric acid and float on the surface of the antimony liquid so as to realize the separation of the cadmium and the ferrum from antimony; and finally, the scum floating on the surface of the antimony liquid is removed. The method for removing the cadmium and the ferrum from the crude antimony, disclosed by the invention, belongs to an originate at home and abroad, the effect of cadmium and ferrum removal is good, the process flow is simple, the operation is convenient, the production cost is low, the pollution of environment cannot be generated, the production practicality is strong, considerable economic benefits are produced, and meanwhile, excellent environmental benefits are also brought.