The invention discloses a medical low-temperature steam 
formaldehyde sterilization cabinet and a sterilization method thereof. The medical low-temperature steam 
formaldehyde sterilization cabinet comprises a cabinet body, a sterilization cavity, a 
formaldehyde water solution 
medicine feeding device, a steam generator, an 
electric control device, an evacuating device and a clean air supplying 
system, wherein the sterilization cavity comprises a sterilization chamber, a heating jacket and a sterilization chamber door; the steam generator comprises a 
heat supply medium box; a formaldehyde 
vaporization pipeline, a heating device, a 
heat supply medium pipeline port, a low-temperature steam outlet and a waste liquid outlet are formed in the 
heat supply medium box; a 
medicine outlet pipeline of the formaldehyde water solution 
medicine feeding device is connected to the inlet of the formaldehyde 
vaporization pipeline; the outlet of the formaldehyde 
vaporization pipeline is connected to the sterilization chamber; the low-temperature steam outlet is connected to the sterilization chamber and the heating jacket through pipelines; the evacuating port of the evacuating device is connected to the sterilization chamber; the air supply end of the clean air supplying 
system is connected to the sterilization chamber. By mixing the low-temperature steam and the formaldehyde gas for sterilization at the 
vacuum state, the sterilization effect is complete without dead angle, and the residual formaldehyde gas can be eliminated completely after sterilizing.