An adjusting assembly for a drum support includes multiple adjusting holes defined through the second extension of the secondary base and multiple fixing holes defined in the first extension of the primary base. One adjusting hole corresponds to and aligns with at least two fixing holes such that relative position of the second extension to the first extension is easily adjusted and secured via fixing bolts. An urging plate received in the seat and pushed by distal free ends of two threaded bolts is able to secure the hook inside the seat to provide a supporting force to the drum.