Kai-Koizumi Station (甲斐小泉駅, Kai-Koizumi-eki) is a railway station in the Koumi Line in the city of Hokuto, Yamanashi Prefecture, Japan, operated by East Japan Railway Company (JR East).

Kai-Koizumi Station is served by the Koumi Line and is 7.1 kilometers from the starting point of the line at Kobuchizawa Station.

The station consists of two ground-level opposed side platforms, connected by a level crossing.

Kai-Koizumi Station was opened on 27 July 1933 by the Japanese Government Railways.

With the privatization of Japanese National Railways (JNR) on 1 April 1987, the station came under the control of JR East.