During 1894-95, Koitsu designed several war prints for the Sino-Japanese war efforts. He later worked as a lithographer. In 1931, Koitsu met the publisher Watanabe at an exhibition commemorating the work of Kiyochika. The following year he designed the first of many prints for Watanabe, titled Cherry Blossom Viewing at Gion. He went on to design ten prints for Watanabe. Koitsu also designed numerous prints for the publisher Doi Teiichi, as well as several other publishers including Kawaguchi & Sakai, Baba Nobuhiko, and Takemura.
Tsuchiya Koitsu designed shin hanga landscape prints during the same time as the landscape artist Ishiwata Koitsu, but the two men were not related. Their works are sometimes confused since artisans signed both works "Koitsu". However, the styles of their woodblock prints are distinctive.