The present disclosure provides an electronic cigarette atomizer, including an atomization assembly and a liquid reservoir engaging with the atomization assembly； the liquid reservoir includes a liquid storage cavity； wherein the atomization assembly includes a lower holder, an upper holder installed on the lower holder, and a heating assembly clamped between the lower and the upper holders； the heating assembly includes a porous body and at least one heater engaging with the porous body, and the porous body has an atomized side and a liquid absorption side； and the liquid absorption side communicates with the liquid storage cavity, and an atomization cavity is formed between the atomized side and the lower holder. In the present disclosure, the heating assembly is a porous body and is clamped by the upper holder and the lower holder, thus, the structure is stable and the assembly of the heating assembly is facilitated.
