An adjustable drum pedal assembly has a pedal assembly, a drive device and a return device. The pedal assembly is used to operate the adjustable drum pedal assembly and has a pedal, a rotating shaft and a drum hammer. The drive device is connected to the pedal and is mounted on and rotates the rotating shaft. The return device is mounted on the rotating shaft, attached to the pedal assembly, returns the drum hammer and has a rotating bracket, a rotating connector, a spring, a stationary bracket and a pivoting connector. The rotating bracket and connector are attached to the rotating shaft. The spring is connected to the rotating connector. The stationary bracket is attached to the pedal assembly. The pivoting connector is mounted pivotally in the stationary bracket and connects to the spring.