The invention discloses a handheld electric drill, and belongs to the technical field of electric tools. The handheld electric drill mainly comprises a shell body, a power shaft is mounted in the shell, the two ends of the shell body are provided with a front bearing end cap and a rear bearing end cap respectively, the space defined by the front bearing end cap, the rear bearing end cap and the shell forms a bearing chamber, and lubricating oil is filled in the bearing chamber. A handheld part is connected to one end, close to the rear bearing end cap, of the shell, the end portion of the handheld part is connected to an oil tank, the oil tank is communicated with the bearing chamber through an oil inlet pipe and an oil return pipe, a first power pump is arranged on the end portion, located inside the oil tank, of the oil inlet pipe, the handheld part is provided with a hollow power source mounting chamber, an electromotor is mounted in the power source mounting chamber, the electromotor is in transmission connection with a power shaft through a bevel gear pair, and the oil inlet pipe and the oil return pipe both penetrate through the power source mounting chamber. According to the handheld electric drill, lubricating oil lubrication is achieved, the service life of the handheld electric drill is prolonged, and the handheld electric drill is widely applied to the processing and manufacturing of electric tools.