The utility model discloses a tool for quickly opening a secondary seal. The tool comprises an outer shell, an end face supporting plate is arranged at one end of the outer shell, a holding handle is arranged at the other end of the outer shell and comprises a main holding handle part and a pulling rod, the main holding handle part is connected with the pulling rod through a shaft, a draw bar is arranged on the outer shell in the axial direction, one end, close to the end face supporting plate, of the draw bar is connected with a push plate, the draw bar is sleeved with a first push piece and a second push piece, the first push piece is connected with the pulling rod, a first spring is arranged between the first push piece and the end face of the outer shell, the second push piece is obliquely arranged relative to the draw bar, one end of the second push piece is fixed in a hinged mode, a second spring is arranged between the second push piece and the main holding handle part, and the first spring and the second spring are arranged on the draw bar in a sleeved mode. The tool can be used by one person to complete work which can only be completed by 3-4 persons in 2 hours, detection time is shortened to 1.5 hours, time and labor are saved, and labor cost can be greatly lowered.