The utility model provides a device for measuring the long-term water absorption rate of gravel aggregates. The device comprises a graduated pipette, a bottle stopper and a wide neck flask, wherein the wide neck flask is used for containing to-be-tested gravel aggregates and water, and the gravel aggregates are completely soaked in the water; the bottle stopper is used for sealing the wide neck flask; the graduated pipette penetrates through the bottle stopper and is inserted into the wide neck flask; and when the water level in the graduated pipette reaches a display scale range, the periphery of the bottleneck of the wide neck flask and a socket of the graduated pipette are sealed by using paraffin, and a small amount of oil drops are injected into the graduated pipette. According to the device provided by the utility model, the gravel aggregates are placed into the sealed wide neck flask, the scale of the water level in the pipette is read in real time and is used for calculating the long-term water absorption rate of the gravel aggregates, the method is convenient, and the result is accurate, thereby providing a technical support for grasping the properties of the gravel aggregates, and optimizing concrete mix proportions and engineering design.