Cold box sealing gas continuous supply device and method for nitrogen production line

The invention relates to the technical field of industrial nitrogen generation, and discloses a cold box sealing gas continuous supply device and method for a nitrogen generation production line, the cold box sealing gas continuous supply device comprises the nitrogen generation production line, a first valve V1, a second valve V2 and a controller, a nitrogen preparation port is communicated with a sealing gas interface through the first valve V1, and the second valve V2 is communicated with the nitrogen preparation port through the second valve V2. The nitrogen interface is communicated with the sealing gas interface after passing through the second valve V2, and the controller is electrically connected to the first valve V1, the second valve V2 and the nitrogen production line; the controller comprises a parameter detection module, a first shutdown rule judgment module and a first shutdown instruction sending module; the device has the effect of guaranteeing continuous supply of the sealing gas of the cold