An integrated grain drying/storage/regulating bin with a built-in ventilation pipe and an externally disposed compartment comprising: an integrated bin body, a grain distributing device, an external compartment provided outside the integrated bin body, an internal ventilation pipe provided inside the integrated bin body, a heating device, a refrigerating device, a humidifying device, an air flow distributing device, a centrifugal fan, and an air brake, wherein a top of the integrated bin body is provided with a grain feed port, the grain distributing device is disposed inside the grain feed port and at a lower end thereof, a middle portion of the integrated bin body is provided with several levels of the internal ventilation pipe, the external compartment is provided at a periphery of the integrated bin body; characterized in that the air flow distributing device is located at the bottom of the bin and communicated with the external compartment installed on the inner periphery of the integrated bin body and further communicated with the internal ventilation pipe provided inside the integrated bin body via the external compartment and a grain layer; the heating device, the refrigerating device, and the humidifying device are disposed outside the integrated bin body, and are connected with the air flow distributing device through a duct; a plurality of air suction ducts are arranged in the integrated bin from top to bottom, one end of the air suction duct is communicated with the internal ventilation pipe in the integrated bin, the other end of the air suction duct is connected with the air brake, and all the air suction ducts are connected with a centrifugal fan, and the integrated grain drying/storage/regulating bin further comprising an on-line temperature monitoring device, an on-line moisture monitoring device and a self-control device related thereof to automatically start or close the air brake on the air suction ducts and to the control centrifugal fan, the heating device, the refrigerating device, and the humidifying device. an integrated bin body, a grain distributing device, an external compartment provided outside the integrated bin body, an internal ventilation pipe provided inside the integrated bin body, a heating device, a refrigerating device, a humidifying device, an air flow distributing device, a centrifugal fan, and an air brake, wherein a top of the integrated bin body is provided with a grain feed port, the grain distributing device is disposed inside the grain feed port and at a lower end thereof, a middle portion of the integrated bin body is provided with several levels of the internal ventilation pipe, the external compartment is provided at a periphery of the integrated bin body; characterized in that the air flow distributing device is located at the bottom of the bin and communicated with the external compartment installed on the inner periphery of the integrated bin body and further communicated with the internal ventilation pipe provided inside the integrated bin body via the external compartment and a grain layer; the heating device, the refrigerating device, and the humidifying device are disposed outside the integrated bin body, and are connected with the air flow distributing device through a duct; a plurality of air suction ducts are arranged in the integrated bin from top to bottom, one end of the air suction duct is communicated with the internal ventilation pipe in the integrated bin, the other end of the air suction duct is connected with the air brake, and all the air suction ducts are connected with a centrifugal fan, and the integrated grain drying/storage/regulating bin further comprising an on-line temperature monitoring device, an on-line moisture monitoring device and a self-control device related thereof to automatically start or close the air brake on the air suction ducts and to the control centrifugal fan, the heating device, the refrigerating device, and the humidifying device.