The utility model provides an insulating plate mounting mechanism, and belongs to the field of insulating plate laying. Comprising a partition plate and a plurality of insulation boxes, gaps exist between the insulation boxes, the partition plate is installed in the gaps, the side walls of the partition plate are attached to the side walls of the insulation boxes, an installation structure is arranged in the partition plate and composed of a clamping part, a fixing part and a positioning part, and the clamping part is fixedly connected with the side walls of the insulation boxes and connected with the bottom of the partition plate in a clamped mode; the clamping and fixing component penetrates through the top end of the partition plate and is fixedly connected with the steel plate layer, the positioning component is installed in the partition plate, the positioning end of the positioning component is attached to the surface of the insulation box, and the clamping and fixing component, the fixing component and the positioning component are combined to achieve rapid fixed connection of the insulation box and the partition plate and facilitate horizontal positioning of the insulation box when the insulation box is fixed. In addition, the operation convenience of constructors is fully considered. The installation structure is relatively simple, operation is convenient, complex installation tools are not needed, and construction difficulty and labor intensity are reduced.