The invention discloses a safety bracket bearing and locking device used for bearing a loading device and locking the borne loading device. The safety bracket bearing and locking device comprises a left support (2), a right support (21), a rear locking rod (3) and a front locking rod (4). The left support (2) and the right support (21) are separately fastened to a base body (1), the rear locking rod (3) and the front locking rod (4) respectively penetrate through the left support (2) and the right support (21), the rear locking rod (3) comprises a rear rod body and an ejection double-screw bolt part (6), the ejection double-screw bolt part (6) and the left end of the rear rod body are axially and fixedly connected through a rear thrust bearing (36), the front locking rod (4) comprises a front rod body and a drawing swivel nut part (8), the left end of the front rod body and the drawing swivel nut part (8) are axially and fixedly connected through a front thrust bearing (48), and the outer circumferences of the ejection double-screw bolt part (6) and the drawing swivel nut part (8) are provided with external threads respectively.