The present invention relates to an under-actuated robotic finger with joint locking mechanisms, including: a base body; a first finger part coupled rotatably to the base body; a second finger part coupled rotatably to the first finger part; a first hinge part adapted to rotatably connect the base body and the first finger part; a second hinge part adapted to rotatably connect the first finger part and the second finger part; a first locking mechanism adapted to restrict the rotation of the first finger part; and a second locking mechanism adapted to restrict the rotation of the second finger part.