The invention discloses an environment-friendly medical wastewater treatment device which structurally comprises an integral treatment cylinder, support blocks, a wastewater inlet tube, a feeding repairing window, a sealing cover, a residual sludge discharge tube, a partition plate, a reclaimed water discharge tube, a precipitate discharge tube, a contact oxidation chamber I, activated sludge, a contact oxidation chamber II, a water submergible oxygen charge aerator, a biological membrane net, a mixing reaction chamber, a coagulant, an on-line pH value tester, a precipitate filtering chamber, a backwash tube and a disinfectant supply tube, wherein the support blocks are uniformly arranged below the integral treatment cylinder at equal intervals and are perpendicularly connected with the integral treatment cylinder via electric welding. Due to adoption of the water submergible oxygen charge aerator, underwater oxygen supply and aeration are adopted, the aeration noise is reduced, relatively sufficient aeration is achieved, the oxygen supply efficiency is improved, sufficient oxygen is supplied to bio-membrane treatment, deep treatment on medical wastewater is achieved, the quality of effluent of medical wastewater is improved, and the practicability of the medical wastewater treatment device is improved.