Using information gathered from 2000 to 2014, Greenpeace said Chinese companies had fished in prohibited grounds or under-declared their catches.
Boats either turned off their identification systems or transmitted false location data, it added.
One company's fishing capacity off the coast of Guinea Bissau is said to have exceeded its authorised limit by 61%.
The absence of efficient fisheries management in some West African states allows rogue companies to plunder marine resources, the BBC's Thomas Fessy reports from Dakar in Senegal.
In less than a month, Greenpeace documented an average of one new case of illegal practice by a Chinese-owned boat every two days, but the report's authors say they think that is only the "tip of the iceberg."
Chinese companies were "unlawfully exploiting West Africa's marine environment," said Rashid King, head of Greenpeace East Asia's China Ocean Campaign, in a statement.
"They were taking advantage of weak enforcement from local and Chinese authorities to the detriment of local fisherman and the environment."
'Exploiting'
Mr Kang said unless the Chinese government controlled rogue fishermen, it would "seriously jeopardise" its mutually beneficial partnership with West Africa.
China came to West Africa's aid during the Ebola outbreak, Mr Kang said, but Chinese companies were "exploiting" West Africa's marine environment.
In the most recent cases, the Greenpeace ship MY Esperanza, which sailed off Senegal, Guinea-Bissau and Guinea last autumn, documented 16 illegal fishing activities by 12 Chinese vessels.
Chinese companies are escaping licensing fees and plundering West Africa's fishing resources, Greenpeace says
Over the last 15 years, Greenpeace has also investigated illegal fishing practices by EU, Korean and Russian fishing vessels in Africa.
From 1985 to 2013, China expanded its Africa fishing operations from 13 to 462 vessels.
The vessels were mostly bottom trawlers, which Greenpeace calls "one of the most destructive fishing vessels in the industry".
Source: BBC
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