The invention provides an inclined plate type fin which comprises horizontal parts and inclined parts. The horizontal parts and the inclined parts are connected, protrusions are machined on the inclined parts in a stamping mode, and therefore fluid at the two sides of each inclined part is communicated through holes formed in the inclined parts in a stamping mode. The protrusions extend outwards from the inclined parts in the flowing direction of mixtures. The inclined plate type fin is novel and suitable for a plate-fin heat exchanger, so that condensation of multi-component mixed media different in boiling point is achieved; the heat exchange efficiency is improved, and the fluid flowing resistance is lowered.