The invention relates to an electric water pump with an efficient heat dissipation and vibration reduction structure. The electric water pump comprises a rear cover, a rear cover sealing ring, a waterpump controller, a coil connecting terminal, a 
stator coil sheath, a coil, a motor 
stator, a motor shell, an inner cover, a water pump 
volute, a water pump 
impeller, a motor rotor shaft, an 
axial thrust wheel, a rotor front bearing, a rotor front 
bearing vibration reduction ring, a bearing seat, a motor rotor, an inner cover small-head sealing ring, a rotor rear 
bearing vibration reduction ring,a rotor rear bearing, an axial-flow-type guide 
impeller, a 
breathing device bracket, a gas-permeable membrane, a 
breathing device sealing ring and an elastic cylindrical pin. According to the electricwater pump with the efficient heat dissipation and vibration reduction structure, a multistage vibration reduction structure is adopted to restrain vibration of the electric water pump to the minimum, through an internal water-cooling 
system, a structure for improving coil heat dissipation on a motor 
stator and the cooperation between 
breathing and cooling of breathing out inner cavity hot air from a 
breathing system to suck in external 
cold air, thermal loads of the electric water pump are restrained, the heat dissipation efficiency is greatly enhanced, and high 
operational reliability of the electric water pump is improved.