The shells, each of which weighs 2.5 kg and is 30 cm long, were found in Qiqihar city by a group of workers at a construction site near a railway station, Xinhua news agency reported.
A worker spotted a rusty shell while digging about two metres deep into the ground.
Later, the other three shells were also found nearby.
People near the site were evacuated after the discovery, the police said.
The shells were well preserved and had a risk of explosion.
Two Japanese chemical weapon units were once stationed in Qiqihar.
After the Japanese retreated, large amounts of bombs, shells and mines were left behind.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.