The present invention is a high reach lifting big bale fork attachment for attachment to a wheel loader, a large front end loader for an agricultural tractor, a large construction loader, a large forklift or other big bale handling equipment. The high reach lifting big bale fork attachment has a rear coupler slide assembly slidingly connected to a sliding mast assembly having two spaced mast I-beams each beam having a straight rear rail and an arced front rail. When attached to a wheel loader or bale handling equipment, the invention provides improved elevation and offset capabilities to the wheel loader or other bale handling equipment in lifting, moving, tilting, and depositing or retrieving one or more vertically stacked bales onto or from a place of deposit such as the ground, hay barn or shed, or a preexisting bale stack in an agricultural setting. When equipped with the invention, the bale handling equipment can place or retrieve bales higher and further forward and over higher obstacles.