The invention relates to a LD pumping high-power 2Mum wavelength medical Tm LASER, consisting of a LD pumping system, a laser crystal rod, an optical resonant cavity, a water-cooling system, a drying system, a focusing mirror and an optical fiber. The LD pumping system takes GaAlAs semiconductor laser array as a pumping source, comprising 3 groups of LD array modules in total; the laser crystal rod adopts a Tm-doped bonding crystal rod; the optical resonant cavity is a planoconcave cavity; the water cooling system can make the laser crystal rod operate under low temperature; the drying system is a nitrogen-filled drying box in which the complete laser optical path is arranged; the laser is coupled to the optical-fiber output by the focusing mirror. The invention has the advantages that 2Mum wavelength laser can be exported high efficiently, vaporized incision of prostate and other soft tissues can be conducted under water environment efficiently, the operation is rapid, and the manipulation is easy, and damages are avoided; the invention can be extensively applied to the clinic fields of urinary surgery, orthopaedics, gynecopathy, dyspepsia and various minimally invasive operations, etc.. Therefore, the invention is an ideal medical LASER.