The invention provides a handheld electric drill convenient to adjust. The handheld electric drill comprises a fixing ring buckle, a hollow rod, a lead screw, a nut base, a protecting plate, a tiny fan, a storing shell, a partition plate, a dust clearing cover and a dust sucking opening. The fixing ring buckle is installed on the ring-shaped side face of a drill body. The hollow rod is arranged onthe lower end face of the fixing ring buckle. The lead screw is arranged in the hollow rod. The nut base is arranged on the lower end face of the hollow rod. The lead screw is installed on the ring-shaped side face in the nut base. The protecting plate is arranged on the lower end face of an auxiliary handle. According to the handheld electric drill, the problem that an original handheld electricdrill is inconvenient to adjust is solved, the storing shell is arranged on the lower end face of an installing block, the tiny fan is arranged on the upper side in the storing shell, the partition plate is arranged on the lower end face of the tiny fan, the dust clearing cover is arranged on the bottom of the storing shell, a dust sucking opening is formed in the left end face of the storing shell, and the problem that the original handheld electric drill does not have a dust sucking function is solved. The handheld electric drill is reasonable in structure, convenient to adjust and comfortable to use.