Automatic take-up and pay-off device for rail engineering vehicle

The invention provides an automatic take-up and pay-off device for a rail engineering vehicle. An automatic take-up and pay-off device for a rail engineering vehicle comprises a wire coil frame. According to the automatic take-up and pay-off device for the rail engineering vehicle, the self-locking characteristic of a worm and gear structure is adopted through transmission, after a driving device stops acting, a wire coil can rapidly stop rotating and is prevented from being reversely dragged by the wire coil, in addition, an emergency operation opening is formed in the end of a worm, and when electric driving fails, the wire coil can be driven by the wire coil to rotate. Manual emergency operation can still be carried out; meanwhile, the spline shaft of the wire coil shaft is connected through the friction torsion limiting elastic coupler, the friction torsion limiting elastic coupler can be provided with a specified torque value, in the take-up and pay-off process, if tension on a cable is too large, and th