A detection packaging structure based on a flexible tube, comprising: a main circuit board, a detection circuit board, a detection component, an instrument tube, a tube cap, and an outer tube, wherein the detection circuit board board is perpendicularly disposed on a first side surface, along a first direction, of the main circuit board, the instrument tube is disposed on a second side surface, along the first direction, of the main circuit board, and the detection component is disposed, along a second direction, on a first side surface of the detection circuit board; the tube cap is mounted on the second side surface of the main circuit board, and is connected to an end of the instrument tube; a first conducting material is disposed on the first side surface, along the second direction, of the detection circuit board, a second conducting material capable of being conducted to the first conducting material is disposed on a second side surface, along the second direction, of the detection circuit board, a detection conducting material is disposed on the first side surface of the main circuit board, a wiring terminal of the detection component is conductively welded to the first conducting material, one end of the detection conducting material is conductively welded to the second conducting material, and the other end of the detection conducting material is conductively connected to a cable; the main circuit board, the detection circuit board, the detection component, the tube cap, and a part of the instrument tube are all disposed in the outer tube, and the outer tube is directly or indirectly connected to a flexible controllable curved tube; and the first direction is perpendicular to the second direction. wherein the detection circuit board board is perpendicularly disposed on a first side surface, along a first direction, of the main circuit board, the instrument tube is disposed on a second side surface, along the first direction, of the main circuit board, and the detection component is disposed, along a second direction, on a first side surface of the detection circuit board; the tube cap is mounted on the second side surface of the main circuit board, and is connected to an end of the instrument tube; a first conducting material is disposed on the first side surface, along the second direction, of the detection circuit board, a second conducting material capable of being conducted to the first conducting material is disposed on a second side surface, along the second direction, of the detection circuit board, a detection conducting material is disposed on the first side surface of the main circuit board, a wiring terminal of the detection component is conductively welded to the first conducting material, one end of the detection conducting material is conductively welded to the second conducting material, and the other end of the detection conducting material is conductively connected to a cable; the main circuit board, the detection circuit board, the detection component, the tube cap, and a part of the instrument tube are all disposed in the outer tube, and the outer tube is directly or indirectly connected to a flexible controllable curved tube; and the first direction is perpendicular to the second direction.