Disclosed is an electronic atomization device, which includes a suction nozzle, an oil cup assembly, an atomization core assembly and an electrode assembly. The atomization core assembly includes a heater support with a first stepped structure, an atomization core body supported by the heater support, a sealing washer sleeved on the atomization core body and closely contacting with the first stepped structure, an electrode connecting part connected with an end of the heater support via an insulating ring and an air hole connecting part disposed in the atomization core body. The oil cup assembly includes an oil cup body having an airway tube for connecting with the air hole connecting part, a first connecting element removably connected with the suction nozzle and a second connecting element having a second stepped structure formed therein for fitting the sealing washer. According to the present invention, its atomization core is easy to be changed.