A diaphragm for a speaker, the diaphragm comprising a suspension edge and a vibration unit , and a supporting frame , wherein the suspension edge comprises: an inner suspension edge portion for connecting with the vibration unit , wherein said inner suspension edge portion comprises an inner suspension edge body and at least two inner side elastic ribs radially protruded from said inner suspension edge body , wherein each of said inner side elastic ribs forms a bulge on a first side of said inner suspension edge portion and a flute on an opposite second side thereof; and an outer suspension edge portion for connecting with the supporting frame , wherein said outer suspension edge portion comprises an outer suspension edge body and at least two outer side elastic ribs radially protruded from said outer suspension edge body , wherein each of said outer side elastic ribs forms a protrusion on a first side of said outer suspension edge portion and a groove on an opposite second side thereof, characterized in that said supporting frame comprises a first support frame and a second support frame connected with said first support frame , wherein said suspension edge is connected to said first support frame and said second support frame is adapted to support a magnetic coil unit of the speaker; wherei said first support frame comprises a plurality of wave-shaped protruding teeth annularly arranged inside and an indented groove formed between two adjacent protruding teeth , wherein each outer side elastic ribs are outwardly extended from an external edge of two adjacent protruding teeth which form said indented groove ; and wherein said vibration unit comprises a plurality of wave-shaped convex teeth arranged on an outer side and a notch formed between two adjacent convex teeth , wherein each inner side elastic ribs are outwardly extended from an outer edge of two adjacent convex teeth . an inner suspension edge portion for connecting with the vibration unit , wherein said inner suspension edge portion comprises an inner suspension edge body and at least two inner side elastic ribs radially protruded from said inner suspension edge body , wherein each of said inner side elastic ribs forms a bulge on a first side of said inner suspension edge portion and a flute on an opposite second side thereof; and an outer suspension edge portion for connecting with the supporting frame , wherein said outer suspension edge portion comprises an outer suspension edge body and at least two outer side elastic ribs radially protruded from said outer suspension edge body , wherein each of said outer side elastic ribs forms a protrusion on a first side of said outer suspension edge portion and a groove on an opposite second side thereof, characterized in that said supporting frame comprises a first support frame and a second support frame connected with said first support frame , wherein said suspension edge is connected to said first support frame and said second support frame is adapted to support a magnetic coil unit of the speaker; wherei said first support frame comprises a plurality of wave-shaped protruding teeth annularly arranged inside and an indented groove formed between two adjacent protruding teeth , wherein each outer side elastic ribs are outwardly extended from an external edge of two adjacent protruding teeth which form said indented groove ; and wherein said vibration unit comprises a plurality of wave-shaped convex teeth arranged on an outer side and a notch formed between two adjacent convex teeth , wherein each inner side elastic ribs are outwardly extended from an outer edge of two adjacent convex teeth . <EOS>