The invention discloses an airtight conveying method for high-temperature solid materials. The airtight conveying method for the high-temperature solid materials comprises the steps that sealed feeding is conducted, the high-temperature solid materials from a material source device are charged into a material carrying tank (200) in a sealed mode in the feeding position; airtight conveying is conducted, the material carrying tank is conveyed to the discharging position, and the high-temperature solid materials are stored in the material carrying tank in the sealed mode in the conveying process; and sealed discharging is conducted, and the materials are discharged out of the material carrying tank in the discharging position in a sealed mode. The method comprises the step of sealed feeding, the step of airtight conveying and the step of sealed discharging. The materials are charged into the material carrying tank in the sealed mode in the step of sealed feeding. The material carrying tank is conveyed through a lifting and transferring tool in the step of airtight conveying. A sealed discharging device is particularly designed for achieving sealed discharging in the step of sealed discharging. In this way, airtight charging, conveying and discharging are achieved in the whole process, the charged materials are accurately metered, operation is convenient, automatic operation and monitoring can be achieved, and various requirements for high-temperature resistance, airtightness, safety, stability and the like of high-temperature solid material conveying can be met.