Fire crews were unable to save any of the plant after being called to the fire at the former Wolsey Works site on Sock Island, which is being redeveloped for housing.
The equipment is owned by AR Demolition, which is clearing the derelict factory site for the multi-million pound scheme.
The reports that the vehicle cabs of four heavy plant machinery vehicles, including two excavators and a dumper truck, were all on fire when two crews from Leicestershire Fire & Rescue Service arrived on Sunday afternoon.
Crew manager Mark Waddingham told the paper: "There is 100% fire damage to the vehicles which has caused £350,000 damage, according to the owner."
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