Preparation method of loudspeaker diaphragm

The invention discloses a loudspeaker diaphragm preparation method, which comprises: 1, adding 100 parts of thermosetting epoxy resin, 30-60 parts of thermoplastic acrylic resin, 3-8 parts of diaminodiphenylmethane, 10-20 parts of N-vinylpyrrolidone, 2-6 parts of 4, 4 '-diaminodiphenylmethane, and 1-5 parts of a silane coupling agent into a reaction kettle, and uniformly stirring in a vacuum manner to form a first mixture; 2, adding 1-2 parts of vinyl siloxane, 0.01-0.4 part of dimethylethanolamine and 10-30 parts of filler into the first mixture, uniformly dispersing, and discharging to obtain an adhesive; and step 3, coating the adhesive obtained in the step 2 on the upper surface and the lower surface of a foaming base material layer, respectively covering a first metal layer and a second metal layer on the upper surface and the lower surface of the foaming base material layer, and performing hot rolling, pressing and curing to form the loudspeaker diaphragm. According to the loudspeaker, the sound output