The invention discloses a radiator and a radiator component. The radiator comprises multiple cooling fins, wherein a to-be-radiated power device is suitably clamped between any two adjacent cooling fins, and a first water channel and a second water channel which are separated from each other are arranged in each cooling fin; a first flow leader; a second flow leader; a main water inlet pipe, wherein the main water inlet pipe is communicated with an inlet of each first water channel, and the main water inlet pipe is communicated with the inlet of each second water channel through the first flowleader; a main water outlet pipe, wherein the main water outlet pips is communicated with an outlet of each first water channel, and the main water outlet pipe is communicated with the outlet of eachsecond water channel through the second flow leader; and a heat transferring medium, wherein a flowing direction of the heat transferring medium at the first water channel is opposite to the flowingdirection at the second water channel. According to the radiator disclosed by the embodiment of the invention, the two-way flowing of the heat transferring medium in the first water channel and the second water channel is guaranteed through the first flow leader and the second flow leader, thereby effectively balancing the temperature difference of the to-be-radiated devices and improving the performance and service life of the radiator component.