Disclosed are a heating piece for an atomizer, the atomizer (20) and an electronic cigarette. The heating piece includes a support member (100), and a heating member (200, 500, 600, 700) and an extraction electrode (800) disposed on the support member (100) and coupled with one another. The support member (100) or heating member (200, 500, 600, 700) has through holes. The heating piece is a mesh-shaped structure capable of achieving uniform heating, avoiding scorching of e-liquid, guiding an e-liquid smoothly, and providing good stability. A condensate flows back by means of a support slope (8) and passes through the through hole of the heating piece (5), permeates into a liquid guide cotton (10), and enters into an atomization chamber (9) for further atomization.