A fast heat-sinking device for evaporators according to the present invention is disclosed, comprising at least one heat-sinking component which is formed by means of conjunctively assembling an outer wall board and an inner wall board; the interior of the outer wall board includes a semi-open first evaporation area; the interior of the inner wall board includes a semi-open second evaporation area, and the inner wall board is concavely configured with a gap; as such, the inner wall board is attached onto one side of the outer wall board thus further being assembled into the heat-sinking component, and the first evaporation area and the second evaporation area are connected in communication at the notch so as to together form an air concentration area, as a heat-sinking structure of the evaporator.