Supporting device between sleeve steel chimneys

The utility model discloses a supporting device between sleeve steel chimneys. The supporting device is characterized in that an outer cylinder lower flange plate is fixedly mounted at the top of a lower cylinder wall of an outer cylinder; an outer cylinder upper cylinder wall is movably mounted on one side of the top of the outer cylinder lower flange plate; the utility model has beneficial effects. The inter-barrel supporting seat is supported between the outer barrel lower flange plate and the outer barrel upper flange plate, so that a certain distance is formed between the outer barrel lower barrel wall and the outer barrel upper barrel wall; after the inter-cylinder supporting seat is installed, a certain distance is reserved between the outer cylinder lower flange plate and the outer cylinder upper flange plate due to the supporting effect of the inter-cylinder supporting seat, so that the installation worker can stretch into the hand to conduct connection operation on the inner cylinder upper flange pl