The invention discloses a safety joint device for carrying a baby carrier. The safety joint device comprises a first joint piece, a second joint piece, a carrier seat, a triggering piece, a connecting piece and a safety module, wherein the second joint piece is pivoted to the first joint piece along a pivotal axis, the carrier seat is arranged on the first joint piece and the second joint piece and used for assembling and disassembling the baby carrier, the triggering piece is movably arranged on the carrier seat, the connecting piece is movably arranged on the carrier seat and correlated to the triggering piece in a responding manner, the safety module is formed on the first joint piece, and the safety module comprises a receiving module and a limiting module. According to the safety joint device, only when the first joint piece and the second joint piece are pivoted to an unfolding position, the baby carrier can be loaded onto the carrier seat; after the baby carrier is taken away, the connecting piece allows the pivoting of the first joint piece, so that the application safety of the baby carrier can be guaranteed by the safety joint device, and the sitting safety of babies can be improved; meanwhile, the safety joint device also has advantages of simple and compact structure.