Anti-runaway device for elevator

The invention discloses an anti-runaway device for an elevator. The anti-runaway device comprises a first guide rail, a second guide rail and a lift car; the lift car is movably mounted between the first guide rail and the second guide rail, and a lift car frame embraces the outer side of the lift car; and two sets of hydraulic buffers are symmetrically welded to the lower end face of the lift car. According to the anti-runaway device for the elevator, a push rod motor, a first position clamping plate, a second position clamping plate, a third position clamping plate and the hydraulic buffersare arranged, and the push rod motor drives the clamping plates to penetrate through a plate through groove to block the falling elevator so as to avoid runaway of the elevator; the three sets of clamping plates simultaneously stretch out, thus the clamping plate nearest to the elevator can be found according to the runaway position of the elevator, and the velocity vector of the elevator is decreased; and meanwhile, the