The invention discloses an emergent opening system of an electric rolling door device, which mainly comprises a transmission electric motor of a rolling door and a transmission assembly of the rollingdoor. A transmission shaft of the transmission electric motor of the rolling door is connected with a big chain wheel, and a chain wound on the big chain wheel is connected with an automatic door pulling device. The door pulling device comprises a chain transmission electric motor fixed on a casing. A gearbox transmitted by the chain transmission electric motor is fixed on a mounting plate of theelectric motor. The chain transmission electric motor is also connected with a small chain wheel, one end of a chain is wound on the big chain wheel, and the other end of the chain is wound on the small chain wheel. A battery-driven chain with a binding post arranged in an outdoor lock box transmits the electric motor to operate. Compared with the hand-pulling built-in chain in the prior art, andin the dead-electricity state, the emergent opening system of the electric rolling door device uses outlay batteries and the battery-driven chain with a binding post arranged in an outdoor lock box for transmitting the electric motor to operate, and the transmission electric motor of a rolling door is driven to operate by the transmission of the small chain wheel and the big chain wheel to open the rolling door. The operation is labor-saving, convenient and rapid.