The invention discloses a tripping-prevention loop testing device for a breaker. The tripping-prevention loop testing device comprises a shell, a common power source terminal, a switching-on terminal, a trip terminal, a switch and a counting display screen, wherein the common power source terminal, the switching-on terminal, the trip terminal, the switch and the counting display screen are fixed on the shell. The switching-on terminal is connected with the trip terminal in series. The switch is provided with a first moving contact, a second moving contact, a first auxiliary contact and a second auxiliary contact. The trip terminal is connected to the first moving contact in series to form a trip loop. The common power source terminal is connected to the second moving contact in series to form a closing loop. The first auxiliary contact and the second auxiliary contact are respectively connected with the counting display screen and electrically connected to monitoring switch auxiliary contacts through wires to form a closed loop. When the switch is closed, the closing loop and the trip loop are connected at the same time. The tripping-prevention loop testing device for the breaker can ensure simultaneity of switching and closing operation of the breaker, and further avoid the phenomenon that a tripping-prevention loop is displayed to be normal in the manual testing process, while false operation occurs in the operation process.