The invention provides a highly adjustable unloading device, belonging to the field of civil engineering construction. The highly adjustable unloading device comprises a first sleeve, a second sleeveand at least one adjusting rod. One side of the first sleeve remote from the second sleeve is provided as a first bearing surface, and one side of the second sleeve remote from the second sleeve is provided as a second bearing surface; the adjusting lever comprises a first mating end and a second mating end, wherein the first mating end is provided with a first stopper slidably engaged with the adjusting lever, the first stopper is relatively fixedly disposed with respect to the first sleeve position, the second mating end is provided with a second stopper, and the second stopper is relativelyfixedly disposed with respect to the second sleeve position. The relative distance between the first sleeve and the second sleeve can be precisely adjusted by a height-adjustable unloading device. The speed of the unloading carriage is controllable, which avoids the safety risk caused by the sudden sinking of the structure when the carriage is dropped. Not affected by rainfall, no need to wrap protection. The unloading device can be reused without wasting resources.