The beef farmer, who has been living in temporary accommodation, said he visited the farm this morning (Thursday) to find thieves had looted his property.
“I can’t believe the badness in some people,” he said.
“They have taken the horsebox and a load of tools we managed to salvage.
“We put the tools on top of the straw to dry out and thought they’d be safe. Someone’s obviously seen that as an opportunity.
“We haven’t been back to the house yet so we don’t even know if they’ve been in the house.”
Mr Winslade said he would visit his other farm and the family home in the area to check if it had also been targeted by thieves.
West Yeo farm was one of hundreds of businesses and properties to be evacuated after some of the worst floods in history.
At the time, many residents said they felt uncomfortable leaving their flood ravaged homes for fear of being looted.
Mr Winslade added: “Thieves have ransacked my deserted farm despite promises from police they would protect us.”
A spokesman for Avon and Somerset Police said detectives had found the horse box secured in a building on the farm but the tools are still missing. Anyone with any information is asked to call via the 101 number.