The utility model discloses a displacement protection device around broach footboard, including backup pad (8) that are equipped with bracing piece (9), the front and back sets up slide rail (3) on bracing piece (9) with sliding, sets up waist - round hole (7) that prevention slide rail (3) moved backward on slide rail (3), and waist - round hole (7) are passed in bracing piece (9) activity, the front and back sets up broach footboard (1) on slide rail (3) with sliding, is equipped with dog (11) on slide rail (3) and coordinates with broach footboard (1), makes slide rail (3) can not move backward along with (1) the antedisplacement of broach footboard, the broach moves backward protection architecture (13), and it includes back trip rod subassembly (151), the back safety switch (161) who removes along with broach footboard (1), broach antedisplacement protection architecture (14), it includes preceding trip rod subassembly (152), preceding safety switch (162) of removing along with slide rail (3). Compared with the prior art, the utility model discloses can both promptly and accurately judge the trouble in the antedisplacement of broach footboard with when moving backward to in time make the staircase bring to rest, the protection passenger.