Building insulation board cutting device

The invention discloses a building insulation board cutting device which comprises a mounting platform, a mounting cavity is formed in the mounting platform and arranged in the length direction of the mounting platform, and a cutting penetrating-out channel is formed in the top of the mounting cavity; the cutting and pressing mechanism comprises a first driving assembly, a mounting base arranged in the mounting cavity and arranged in the length direction of the mounting platform, a pressing plate arranged above the mounting platform, a cutting piece arranged on the mounting base and a second driving assembly. The first driving assembly drives the mounting base and the pressing plate to do relative/deviating movement so that the pressing plate can tightly press the heat preservation plate, meanwhile, the cutting piece is driven to penetrate out of the cutting penetrating-out channel, and the second driving assembly drives the cutting piece to move in the length direction of the mounting platform. The cutting d