The invention discloses a controlled degradable 
surgical suture thread and a fabricating method thereof. The innermost part is 
chitosan fiber core, the middle part is collagen layer, and the outermost part is ethyloic-
chitosan layer. From innermost to outermost, the thickness ratio of each layer is 2:X:(3-X), wherein X is larger than 1 and smaller than 3. The value of X is related to degradation velocity of the 
surgical suture thread: the larger the value, the faster the degradation velocity of the 
surgical suture thread, and the shorter the healing period of wound suitable to be sutured; andthe smaller the value, the slower the degradation velocity of the surgical suture thread, and the longer the healing period of wound suitable to be sutured. The fabricating method of the surgical suture thread comprises: (1) preparing 
chitosan fiber core and collagen; (2) covering a layer of collagen outside the chitosan 
fiber; (3) covering a layer of ethyloic-chitosan outside the collagen cover of the chitosan fiber; (4) 
processing and 
polishing the suture thread prepared in (3) by an automatic coreless grinder, connecting with 
suture needles of different models to prepare into a finish product of surgical suture thread. The technical scheme of the invention has plentiful advantages: controllable degradation velocity, 
high tension strength, improved 
biocompatibility and anti-infectious property, quick 
wound healing, no obvious 
scars, good 
biocompatibility, etc.