The invention discloses a broadband and stable multi-arm folded acoustic eddy field transmitter, which comprises a substrate, wherein n pieces of spiral grooves are formed in the substrate, and n is a positive integer; when one spiral groove is formed in the substrate, two spiral curves of the spiral groove are as shown in Description; and when two spiral grooves are formed in the substrate, two spiral curve of the mth spiral groove are as shown in Description, wherein m is a positive integer. The acoustic eddy field transmitter disclosed by the invention is of a planar structure, and the thickness of the acoustic eddy field transmitter, in a transmission direction (provided that the transmission direction is in an Z direction), is nearly not limited; therefore, the acoustic eddy field transmitter can be designed as an ultra-thin sheet-shaped structure (the minimal thickness is about 3mm), and meanwhile, the acoustic eddy field transmitter can be made as a thicker cylindrical body in accordance with specific requirements, while the radius of the entire transmitter within an x-y plane is just 3.6cm; by regulating the number of arms of the structure, an acoustic eddy field of corresponding orders can be generated; and the functions, without any circuit control means, can be achieved just by structural properties of the acoustic eddy field transmitter.