The invention provides an emergent stopping device of a car. The device comprises a plurality of braking mechanisms, a car, running guide rails, car doors and a control mechanism, wherein each braking mechanism comprises two braking boxes, a rolling shaft and a roller; the car is movably mounted on the running guide rail through the rollers; the a first mounting chamber and a second mounting chamber are arranged in each braking box; a braking block, a first electromagnetic absorbing component, a first electromagnetic absorbing body, a second electromagnetic absorbing body and a second electromagnetic absorbing component are mounted on each braking box; a buckling component is mounted on each second electromagnetic absorbing component; a buckling hole fitting the corresponding buckling component is formed in each braking box; a plurality of engaging holes are formed in the running guide rails; the cars are movably mounted on the car; a driving device, which is in drive connection with the car doors and can drive the car doors to move, is mounted on the car; the control mechanism comprises a control device and a rotating speed sensor. With the adoption of the device, people in the car can be effectively protected in case of car falling, and moreover, the car can be prevented from secondary falling after stopping falling.