A single-extension suspended type hydraulic upright column comprises a top cover with an ear plate or hemispherical body at upper end thereof, a cylinder sleeve, an oil cylinder, a plunger, a pedestal with an ear plate or hemispherical body at lower end thereof, a guide ring and a sealing element, wherein the top cover with an ear plate or hemispherical body at upper end thereof is provided on the plunger, the oil cylinder is provided inside the pedestal with an ear plate or hemispherical body at upper end thereof, and the lower part of the plunger is sheathed inside the oil cylinder; the cylinder sleeve is provided between the outer side of the plunger and the end of the oil cylinder; a liquid inlet/outlet through-hole is provided on the pedestal with an ear plate or hemispherical body at upper end thereof and communicated with larger variable sealing cavity, and an oil seal is provided on the liquid inlet/outlet through-hole; a liquid inlet/outlet through-hole is provided on cylinder sleeve and communicated with smaller variable sealing cavity, and an oil seal is provided on the liquid inlet/outlet through-hole. The invention is suitable for the hydraulic support of downhole integrated coal mining mechanical working face in coal mine; and has the advantages of compact and reasonable structure, no welding seam structure, good stability, high strength, large carrying capacity, large working stroke, light weight, good sealing performance, long service life, and low cost.