The invention discloses an integral structure of a molded-coal vacuum hard-plastic extruding machine. The integral structure comprises an upper machine part, a lower machine part and a supporting part. The upper machine part comprises a first motor, a first speed reducer, a hopper, an agitating tank, a screw propelling auger and a discharging box, wherein the first motor, the first speed reducer, the hopper, the agitating tank, the screw propelling auger and the discharging box are sequentially arranged from the right end to the left end. The lower machine part comprises a second motor, a second speed reducer, a connecting box, a vacuum chamber, a vacuumizing device, an extruding auger and a mold outlet device, wherein the second motor, the second speed reducer, the connecting box, the vacuum chamber, the vacuumizing device, the extruding auger and the mold outlet device are sequentially arranged from the front end to the back end. The vacuum chamber of the lower machine part is communicated with the discharging box of the upper machine part through the connecting box. Vacuumizing operation is carried out on the vacuum chamber through the vacuumizing device. The integral structure of the molded-coal vacuum hard-plastic extruding machine has the advantages that molding products are not prone to damage, the extruding pressure is large, the molding water content is low, drying is easy, and fire resistance is good; molded coal in multiple shapes can be produced, multiple requirements of users can be met, and production efficiency is high.