Electric grinding machine tool

The invention relates to an electric grinding machine tool comprising a holding body, a grinding disc and a battery, a tool shaft connected with the grinding disc, a driving assembly capable of enabling the tool shaft to rotate when receiving electric power and a circuit board electrically connected with the driving assembly and the battery are arranged in the holding body, and the holding body is provided with a battery mounting seat exposed on the outer surface. The surface of the circuit board is not perpendicular to the tool shaft, the circuit board and the battery mounting seat are respectively arranged on two opposite sides of the tool shaft, and a connecting line of the circuit board and the battery mounting seat penetrates through the tool shaft. By changing the position of the circuit board, the height of the holding body is reduced, so that the gravity center of the holding body is reduced, and the stability of grinding operation is improved. 一种电动研磨工具机，包含一握持本体、一研磨盘及一电池，该握持本体内设有一连接该研磨盘的工具轴，一接受电力时能令该工