The invention provides a panel moving mechanism of a trimming machine. The moving mechanism comprises a first panel bearing platform, a second panel bearing platform and a panel conveying mechanism, wherein the second bearing platform performs forward or backward motion on the conveying mechanism, and is positioned in the middle of the first bearing platform; the first bearing platform performs lifting motion; when the first bearing platform rises to the highest point, the upper surface of the first bearing platform is higher than the upper surface of the second bearing platform; when the first bearing platform drops to the lowest point, the upper surface of the first bearing platform is lower than the upper surface of the second bearing platform; pressure plate mechanisms are arranged on the second bearing platform; each pressure plate mechanism comprises a power component and a pressure plate device; the power components and the pressure plate devices are fixed to the second bearing platform; and each power component drives the corresponding pressure plate device to move. Compared with the prior art, the panel moving mechanism has the advantage that through the adoption of the vertical cooperation of the first bearing platform and the second bearing platform, the integral structure of the trimming machine is more compact.