A fall protection device, comprising: a frame including a first side plate and a second side plate facing to the first side plate, wherein the first side plate has an outer side surface back to the second side plate, and the outer side surface is disposed with a blocking part; a rolling member rotatably disposed between the first side plate and the second side plate and including a shaft and a rolling drum, wherein the rolling drum is provided on the shaft; a safety belt wound around the rolling drum of the rolling member and located between the first side plate and the second side plate, wherein the safety belt is pulled and forces the rolling member to rotate; a braking plate engaged to the rolling member and including an inner side surface facing the outer side surface of the first side plate, and the braking plate coaxially rotating with the shaft; a braking part pivotally disposed on the inner side surface of the braking plate and located between the inner side surface of the braking plate and the outer side surface of the first side plate; the braking part including a blocking portion, wherein the blocking portion of the braking part is pivoted outward to a braking position from a non-braking position to attach the blocking part due to a centrifugal force produced by the rolling braking plate to strict the rotation of the rolling member; and a restoring spring connected between the braking part and the braking plate and adapted to force the braking part to move toward the non-braking position; wherein the inner side surface of the braking plate is provided with a pivot, and the braking part has a pivoting hole fitted around the pivot; a width of the pivot is less than a width of the pivoting hole; charaterised in that the braking part has a propped portion; the propped portion and the blocking portion are respectively located at two sides of the pivoting hole, and two sides thereof are opposite to each other; the propped portion follows the rolling braking plate to move along a moving pathway; the blocking part is located at the moving pathway of the propped portion; when the propped portion passes by the blocking part and is propped by the blocking part that forces the braking part to be pivoted; wherein the braking plate has an outer circumference; an edge of the propped portion is oriented away from a direction toward the pivoting hole, and protrudes out of the outer circumference; when the propped portion passes by the blocking part, the edge passes and is abutting against the blocking part. a frame including a first side plate and a second side plate facing to the first side plate, wherein the first side plate has an outer side surface back to the second side plate, and the outer side surface is disposed with a blocking part; a rolling member rotatably disposed between the first side plate and the second side plate and including a shaft and a rolling drum, wherein the rolling drum is provided on the shaft; a safety belt wound around the rolling drum of the rolling member and located between the first side plate and the second side plate, wherein the safety belt is pulled and forces the rolling member to rotate; a braking plate engaged to the rolling member and including an inner side surface facing the outer side surface of the first side plate, and the braking plate coaxially rotating with the shaft; a braking part pivotally disposed on the inner side surface of the braking plate and located between the inner side surface of the braking plate and the outer side surface of the first side plate; the braking part including a blocking portion, wherein the blocking portion of the braking part is pivoted outward to a braking position from a non-braking position to attach the blocking part due to a centrifugal force produced by the rolling braking plate to strict the rotation of the rolling member; and a restoring spring connected between the braking part and the braking plate and adapted to force the braking part to move toward the non-braking position; wherein the inner side surface of the braking plate is provided with a pivot, and the braking part has a pivoting hole fitted around the pivot; a width of the pivot is less than a width of the pivoting hole; charaterised in that the braking part has a propped portion; the propped portion and the blocking portion are respectively located at two sides of the pivoting hole, and two sides thereof are opposite to each other; the propped portion follows the rolling braking plate to move along a moving pathway; the blocking part is located at the moving pathway of the propped portion; when the propped portion passes by the blocking part and is propped by the blocking part that forces the braking part to be pivoted; wherein the braking plate has an outer circumference; an edge of the propped portion is oriented away from a direction toward the pivoting hole, and protrudes out of the outer circumference; when the propped portion passes by the blocking part, the edge passes and is abutting against the blocking part.