A multifunctional leg training machine (10, 10', 10"), comprising: a framework placed on a bearing surface; and a weight-bearing mechanism connected to said framework and being movable within said framework, said weight-bearing mechanism comprising a longitudinal sliding device set vertically mounted in said framework and movable between opposing top and bottom sides of said framework, a transverse sliding device set slidably coupled to said longitudinal sliding device set and movable between opposing left and right sides of said framework, and a plurality of weight plates selectively mountable at said longitudinal sliding device set to impart a downward pressure to said longitudinal sliding device set so that when a user carries said weight-bearing mechanism with the shoulders, the attached said weight plates give a downward pressure to the user; wherein said longitudinal sliding device set comprises two vertical bars respectively vertically affixed to the opposing said left and right sides of said framework, two sliding sleeves respectively sleeved onto said vertical bars and axially movable along said vertical bars, and a sliding bar fixedly connected between said two sliding sleeves for allowing said transverse sliding device set to slide thereon; the multifunctional leg training machine (10, 10', 10") is characterized in that said transverse sliding device set comprises a pulley holder frame, a plurality of pulleys, a cushion set and two grips, wherein said pulleys being rotatably mounted in said pulley holder frame at two opposite sides relative to said sliding bar, said cushion set being fixedly mounted at said pulley holder frame for stopping at the shoulders of the user operating the multifunctional leg training machine, said grips being affixed to said pulley holder frame corresponding to the user's shoulders for holding by the user. a framework placed on a bearing surface; and a weight-bearing mechanism connected to said framework and being movable within said framework, said weight-bearing mechanism comprising a longitudinal sliding device set vertically mounted in said framework and movable between opposing top and bottom sides of said framework, a transverse sliding device set slidably coupled to said longitudinal sliding device set and movable between opposing left and right sides of said framework, and a plurality of weight plates selectively mountable at said longitudinal sliding device set to impart a downward pressure to said longitudinal sliding device set so that when a user carries said weight-bearing mechanism with the shoulders, the attached said weight plates give a downward pressure to the user; a longitudinal sliding device set vertically mounted in said framework and movable between opposing top and bottom sides of said framework, a transverse sliding device set slidably coupled to said longitudinal sliding device set and movable between opposing left and right sides of said framework, and a plurality of weight plates selectively mountable at said longitudinal sliding device set to impart a downward pressure to said longitudinal sliding device set so that when a user carries said weight-bearing mechanism with the shoulders, the attached said weight plates give a downward pressure to the user; wherein said longitudinal sliding device set comprises two vertical bars respectively vertically affixed to the opposing said left and right sides of said framework, two sliding sleeves respectively sleeved onto said vertical bars and axially movable along said vertical bars, and a sliding bar fixedly connected between said two sliding sleeves for allowing said transverse sliding device set to slide thereon; two vertical bars respectively vertically affixed to the opposing said left and right sides of said framework, two sliding sleeves respectively sleeved onto said vertical bars and axially movable along said vertical bars, and a sliding bar fixedly connected between said two sliding sleeves for allowing said transverse sliding device set to slide thereon; the multifunctional leg training machine (10, 10', 10") is characterized in that said transverse sliding device set comprises a pulley holder frame, a plurality of pulleys, a cushion set and two grips, a pulley holder frame, a plurality of pulleys, a cushion set and two grips, wherein said pulleys being rotatably mounted in said pulley holder frame at two opposite sides relative to said sliding bar, said cushion set being fixedly mounted at said pulley holder frame for stopping at the shoulders of the user operating the multifunctional leg training machine, said grips being affixed to said pulley holder frame corresponding to the user's shoulders for holding by the user.