An angle adjusting cymbal base assembly includes a base body provided with two sliding grooves. A sliding element is put in two sliding grooves and provided with a wedge-shaped pushing portion located at a side thereof. The sliding element is provided with a stopper located at the other side thereof. An adjusting screw bolt is locked to the base body and pushes the other side of the sliding element. The sliding element can be pushed by turning the adjusting screw bolt. The base body is provided with a central pillar connected to a passive element. The passive element is provided with an inclined portion pushed by the pushing portion, is at predetermined degree of inclination, and is pivotally connected to the base body, whereby a lower cymbal is stably supported, the inclined direction does not be change if the lower cymbal is struck, and the inclined direction is easily adjusted.