The invention discloses a vibrating diaphragm for a loudspeaker. The vibrating diaphragm is characterized by comprising a main body part made of resin, and an edge part arranged on the periphery of the main body part; in addition, the edge part is made of thermal curing rubber, comprising a curing agent, a catalyst and a polymer; the curing agent has more than two silane alkyl groups in a molecule; the polymer contains a main chain with saturated hydrocarbons as repeated units; at least one alkenyl is formed at the tail end of the polymer.