A tunneling field effect transistor and a method for fabricating the same are provided. The tunneling field effect transistor includes: a semiconductor substrate and a drain layer formed in the semiconductor substrate, in which the drain layer is first type heavily doped; an epitaxial layer formed on the drain layer, with an isolation region formed in the epitaxial layer; a buried layer formed in the epitaxial layer, in which the buried layer is second type lightly doped; a source formed in the buried layer, in which the source is second type heavily doped; a gate dielectric layer formed on the epitaxial layer, and a gate formed on the gate dielectric layer; and a source metal contact layer formed on the source, and a drain metal contact layer formed under the drain layer.