The invention discloses an anti-condensation nitrogen gas tank which comprises a nitrogen gas conveying pipe connected with the interior of a tank body of the nitrogen gas tank, wherein a first temperature sensor is arranged at the output end, located in the tank body, of the nitrogen gas conveying pipe; a second temperature sensor is arranged in the position, away from the output end of the nitrogen gas conveying pipe, in the tank body; a nitrogen gas heating device is arranged on the nitrogen gas conveying pipe; and the nitrogen gas heating device, the first temperature sensor and the second temperature sensor are connected to a heating controller respectively. The nitrogen gas is heated to the temperature of the interior of the tank body, the temperature difference is prevented, so that the condensation phenomenon is prevented, and the safety of stored materials is guaranteed.