The drugs haul was discovered at a vacant building in Wellington town centre on Friday when a warrant was executed.
Photographs shared by West Mercia Police showed police cars parked on Walker Street and a large number of plants and equipment from inside the property.
A police spokesperson said: "Cannabis plants with a street value of approximately 1 million pounds were discovered at a disused premises in Wellington town centre on Friday.
"Officers from the town's Safe Neighbourhood Team made the discovery following the execution of a warrant. Two men have been arrested."