The present invention relates to a medical apparatus, in particular, a mother-baby endoscope system consisting of hard mother-cholecystoscope and flexible baby-choledochoscope which comprises a multi-channel cholecystoscope utilized as a mother endoscope and a flexible choledochoscope utilized as a baby endoscope The flexible choledochoscope comprises a bendable front end, an instrument channel connected to the front end, an operating part and a light source host machine connected to said operating part via a cable, a video camera system, and a water supply equipment is also connected to the flexible choledochoscope for water supplying. The front end of baby endoscope passes through the instrument channel of the mother endoscope. The multi-channel cholecystoscope enters into gallbladder cavity, removes the gallstones in the gallbladder cavity and gallbladder walls, then the flexible choledochoscope enters into cystic duct, common bile duct, common hepatic duct, left and right hepatic duct in porta hepatis to perform treatments.
