The invention discloses a main thrust oil cylinder connecting structure. The main thrust oil cylinder connecting structure comprises a bottom plate and an annular pressing plate, wherein the bottom plate is fixed to a tight supporting shield or a front shield, and one side of the bottom plate is provided with a groove for containing the top of a main thrust oil cylinder ball head; the pressing plate is used for fixing the main thrust oil cylinder ball head to the bottom plate, the main thrust oil cylinder ball head is sleeved with the pressing plate, the pressing plate is connected with the root of a main thrust oil cylinder, and the pressing plate is detachably connected with the bottom plate; and the pressing plate comprises an upper pressing plate body and a lower pressing plate body which are in an arc shape, and sawtooth structures mutually matched in an inserted mode are arranged in the buckling connection positions of the upper pressing plate body and the lower pressing plate body. According to the main thrust oil cylinder connecting structure, the pressing plate is an inserting part and replaces a circular ring-type pressing plate in the prior art, the upper pressing platebody and the lower pressing plate body are connected in a nested mode, the connecting surfaces of the upper pressing plate body and the lower pressing plate body are in a sawtooth shape, upper sawteeth of the upper pressing plate body are located on the inner side of the lower pressing plate body, the lower portion of the lower pressing plate body is located on the inner side of the upper pressingplate body, the upper pressing plate body and the lower pressing plate body are embedded in a mutually attached mode, and the pressing plate is effectively prevented from falling off when stressed. The invention further discloses a double-shield tunnel boring machine (TBM) comprising the main thrust oil cylinder connecting structure.