Shield body structure of shield tunneling machine

The invention discloses a shield body structure of a shield tunneling machine. The shield body structure of the shield tunneling machine comprises a shield body main body, and the shield body main body comprises a soil cabin, a front shield, a middle shield and a tail shield which are sequentially arranged from front to rear. The shield body structure of the shield tunneling machine is characterized in that no partition plate is arranged between the front shield and the middle shield, the inner space of the front shield is connected with the inner space of the middle shield in a fitting mode to form a gathering cabin, and the gathering cabin is a sealing space; a first rear cabin door, a first air inlet and a first air discharge hole are formed in the outer side wall of the middle shield,and a first front cabin door is arranged on the outer side wall of the front shield; and the gathering cabin communicates with or is cut off from the soil cabin and the tail shield through the first front cabin door and the f