Steel lining tube plate with multi-sealing structure

The invention relates to the technical field of heat exchanger tube plates, in particular to a steel lining tube plate with a multi-sealing structure, which comprises a tube plate main body, a tube sleeve assembling through hole is formed in the tube plate main body, a tube inserting sleeve is inserted in the tube sleeve assembling through hole in a threaded manner, and a tube inserting hole is formed in the tube inserting sleeve. The upper portion of the inserting pipe sleeve is sleeved with an upper sleeve cover in a threaded mode, the side wall of the upper sleeve cover is located at the top of the pipe plate body, the lower portion of the inserting pipe sleeve is sleeved with a lower sleeve cover in a threaded mode, a first-level gasket is arranged between the upper end of the inserting pipe sleeve and the interior of the upper sleeve cover, and a second-level gasket is arranged between the bottom of the side wall of the upper sleeve cover and the top of the pipe plate body. A tube plate lining is arrange