Atomizer and electronic cigarette having same

An atomizer with a compact structure and convenient assembly is provided. The atomizer includes an atomizing sleeve and an atomizing assembly fixed therein, a liquid reserving space configured for storing a tobacco liquid is defined in the atomizing sleeve. The atomizing assembly includes a fixing sleeve and a porous body arranged therein, an aerosol passage and at least one liquid opening are formed in the fixing sleeve. The porous body absorbs tobacco liquid through the at least one liquid opening, and the porous body is hollow inside and having an atomizing space defined therein. A heating coil configured for heating tobacco liquid absorbed from the porous body into tobacco aerosol is fixed in the atomizing space. The aerosol passage configured for ejecting the tobacco aerosol is in communication with the atomizing space. An electronic cigarette having the atomizer is also provided.