The invention discloses a mine pillar reinforcing and fixing device and method, the mine pillar reinforcing and fixing device comprises a fixed pillar body mechanism, a reinforcing block, a reinforcing rod, a folding and fixing mechanism and a reinforcing plate, the reinforcing block is fixedly connected to one end of the fixed pillar body mechanism, the reinforcing rod is arranged at the top of the fixed pillar body mechanism, and the folding and fixing mechanism is arranged on the reinforcing block. The folding fixing mechanism is arranged above the reinforcing rod, and the reinforcing plate is arranged at the top of the folding fixing mechanism. The mining supporting column has the advantages that practicability is high, the bearing plate fixes an ore wall at the top of the mining supporting column, when mining work is carried out in a mine, the ore wall vibrates, vibration is buffered through a hydraulic rod and a spring, the situation that the vibration directly acts on a folder and a fixing column body mechanism, and consequently the mechanism is damaged is avoided, meanwhile, the supporting face of the mining supporting column is enlarged, and mining efficiency is improved. The supporting strength of the mine pillar is improved, and the safety is improved.