Core-replaceable atomizer and electronic cigarette

The utility model provides an atomizer with a replaceable core and an electronic cigarette. The atomizer with the replaceable core comprises a shell, oil storage cotton, a connecting base, an atomizing core assembly and a connecting assembly arranged on the connecting base. The shell is provided with a containing cavity used for containing atomization media, the oil storage cotton is arranged in the containing cavity, the connecting base is arranged on one side of the containing cavity and used for sealing one port of the containing cavity, the atomization core assembly is connected with the connecting base, and the atomization core assembly is arranged in the containing cavity. One end of the atomizing core assembly penetrates through the connecting base and is arranged in the containing cavity, the connecting assembly is arranged between the shell and the atomizing core assembly, and the atomizing core assembly is detachably installed on one side of the shell through the connecting assembly; the atomizer ca