A power supply device for an electronic cigarette and an electronic cigarette. The power supply device for an electronic cigarette includes a power supply body and an adopter. The power supply body is provided with a receiving portion, the receiving portion is provided with a receiving chamber configured to receive an atomization device and an extending opening for a mouthpiece of the atomization device to extend out, and a bottom portion of the receiving chamber opposite to the extending opening is provided with a socket removably connected to a first connector of the atomization device. Two ends of the adapter is provided with a first adapter and a second adapter respectively, the first adapter is removably connected to the first connector, and the second adapter is removably connected to the socket, such that the first connector and the socket are conducted by the adapter.