The utility model relates to an insulating coupler, which is characterized by consisting of a driving end half shaft joint (1), a middle joint (2), a driven end half shaft joint (3), a diaphragm component (4), a driving bolt (5), a compensation cushion block (6), a rubber insulating disc (7), a pin (8) and a rubber insulating elastic sleeve (9), a diaphragm assembly (4) is arranged between the driving end half shaft joint (1) and the middle joint (2) and is connected through a compensation cushion block (6) and a driving bolt (5) to form a diaphragm coupling structure; and a rubber insulatingdisc (7) is arranged between the middle section (2) and the driven end half shaft section (3) and is connected with a pin (8) through a rubber insulating elastic sleeve (9) to form an elastic sleeve pin coupling structure. One half of the coupling is of a diaphragm coupling structure, the other half of the coupling is of an elastic sleeve pin coupling structure, machining and assembling are convenient, the performance of the diaphragm coupling and the performance of the elastic sleeve pin coupling are achieved, and the application working condition of the coupling is improved.