Rotational flow chip type static mixer used for SCR (selective catalytic reduction) denitration

The invention discloses a rotational flow chip type static mixer used for SCR (selective catalytic reduction) denitration, which comprises lateral support beams uniformly arranged on the cross section of a flue, wherein a plurality of longitudinal support beams are vertically and uniformly arranged on the lateral support beams; a mixer unit is arranged below the intersection of each of the lateral support beams and each of the longitudinal support beam; each of the mixer units comprises four rotational flow chips uniformly arranged at four positions below the intersection and two ammonia injection tubes arranged below the rotational flow chips; two nozzles are arranged on each of the ammonia injection tubes; a partition plate is arranged between every two adjacent groups of mixer units. The static mixer has the advantages that nitrogen oxides on the cross section of the flue can be uniformly mixed with ammonia gas in a large area, the number and the quality of internal support structures can also be reduced,