The invention discloses quick dismounting and mounting equipment for an expansion joint of a ball valve. The quick dismounting and mounting equipment comprises a vehicle frame (1), wherein moving wheels (2) are arranged at the bottom of the vehicle frame (1); supporting blocks (3) are correspondingly arranged at the front and rear ends of the upper part of the vehicle frame (1); a lifting air cylinder (4) is arranged between the two supporting blocks (3); a supporting frame (5) is arranged at the extending end of the lifting air cylinder (4); an arc-shaped plate (6) is arranged at the upper end of the supporting frame (5); a plurality of grooves are formed in the inner wall of the arc-shaped plate (6); magnets (7) are arranged in all the grooves; a bolt dismounting and mounting mechanism (8) is arranged at the left end of the vehicle frame (1); and an expansion joint fixing mechanism (9) is arranged at the right end of the vehicle frame (1). The quick dismounting and mounting equipmentdisclosed by the invention has the characteristics that the operation difficulty can be lowered, the labor intensity of workers can be reduced, and the dismounting efficiency can be improved.