Large surface grinding machine working platform and using method thereof

The invention discloses a large surface grinding machine working platform and a using method thereof. The working platform comprises a supporting platform, a first guiding plate device and a second guiding plate device, the supporting platform comprises a plurality of supporting light rails arranged horizontally in the length direction of a walking track of a grinding machine, and a gap is arranged between every two adjacent supporting light rails. The using method includes the steps of firstly, adjusting the horizontal position of the first guiding plate, secondly, lifting and positioning a to-be-machined metal composite plate, thirdly, adjust the vertical position of the first guiding plate, fourthly, adjusting the horizontal position of the second guiding plate, and fifthly, adjusting the vertical position of the second guiding plate. According to the large surface grinding machine working platform and the using method thereof, the machining efficiency of surface treatment of the to-be-machined metal compo