The embodiment of the invention discloses an anode saturation reactor of a direct-current converter valve. The anode saturation reactor comprises a shell, a coil, at least one pair of iron cores and an iron core heat dissipater. Each iron core comprises a first iron core part and a second iron core part which are of an upper and lower U-type structure or a left and right C-type structure; the iron cores are buckled between the inner wall and the outer wall of the coil to form closed coupling; the iron cores are arranged in the circumferential direction of the coil; the iron core heat dissipater is arranged in the inner wall of the coil and makes contact with the iron cores; the iron core heat dissipater is exposed in air and is in butt joint with the shell.