The invention discloses a two-section-type double-iron-core differential transformer used for solving the technical problem that in the existing differential transformer, the linearity is difficult to regulate due to a single iron core. The technical scheme is as follows: a movable iron core (7) is arranged on the basis of the existing differential transformer, wherein the external diameter of the movable iron core (7) is equal to that of an iron core (5), and the structure of the movable iron core (7) is the same as that of the iron core (5); the iron core (5) is screwed at the root fixing position of a threaded rod of a guide rod (6), and the movable iron core (7) is screwed on the threaded rod of the guide rod (6) and can move left and right; and untouchable and freely-moveable gaps are reserved between the external diameters of the iron core (5) and the movable iron core (7) and inner bores of a skeleton of a primary skeleton winding 3. Through changing the distance of the iron cores, the linearity of the differential transformer can be conveniently regulated. The test result shows that when the distance of a pair of iron cores with the length of 9mm is regulated to 1.5mm (delta), the linearity tends to the optimum, and the linear range is enlarged from +/-3mm when delta is 0mm to +/-5mm.