Rapid cooling device for packaging of bag making machine and using method of rapid cooling device

The invention relates to the technical field of conveying and packaging of bag making machines, in particular to a rapid cooling device for packaging of a bag making machine and a using method thereof.The rapid cooling device comprises a fixed plate, a contraction plate is fixedly installed on the lower portion of one side of the fixed plate, and a movable plate corresponding to the fixed plate is fixedly installed at the telescopic end of the contraction plate; after a heat sealing cutter drives a packaging film to be matched with a heat sealing groove for heat sealing, the packaging film and the heat sealing cutter make contact with the side wall of the heat sealing groove at the moment, and water pumps in a first water tank and a second water tank are started so that cooling liquid in the first water tank, a threaded pipe, the second water tank and a flowing tank can circulate; due to the fact that the one-way check valves are arranged between the flowing box and the first water tank and between the flowin