Large-format laser high-speed machining mechanism

The invention belongs to laser machining technology, and particularly relates to a large-format laser high-speed machining mechanism. The large-format laser high-speed machining mechanism comprises aframe body. The frame body is provided with a drive stepping motor, a bias slider-crank mechanism, a linear differential motion travel multiplying mechanism and a laser processing head. The bias slider-crank mechanism comprises a crank and a connecting rod, wherein the crank is connected with the drive stepping motor, and the connecting rod is hinged to the crank. The linear differential motion travel magnifying mechanism comprises a fixedly-arranged fixed rack, a sliding rack and a rolling wheel which is engaged with the fixed rack and the sliding rack, the rolling wheel is connected with theend portion of the connecting rod, the fixed rack and the sliding rack are arranged in parallel, the rolling wheel is arranged between the fixed rack and the sliding rack, the rolling wheel does reciprocating rectilinear moti