The invention discloses a mouth holding type electric toothbrush which structurally comprises a shell, a power supply, a control panel, a bending device, a platform body, a tooth socket, a replaceable toothbrush head, a toothbrush head base, a tooth outer surface cavity, a tooth inner surface cavity, an upper and lower teeth middle cavity, and an electromagnetic vibration device. The electromagnetic vibration device is connected with the power supply and the control panel and is mounted in the tooth outer surface cavity, the tooth inner surface cavity and the upper and lower teeth middle cavity, the replaceable toothbrush head is mounted on the toothbrush head base, and the toothbrush head base is connected with the electromagnetic vibration device through a transfer bar. The mouth holding type electric toothbrush is reasonable and attractive in overall structure, is convenient to use, is directly put into a mouth when teeth are brushed, and alleviates the fatigue of tooth brushing after a user gets up in early morning. With the structural characteristics of the mouth holding type electric toothbrush, the dental face is cleaned at a time only by spending a small quantity of time, the electromagnetic vibration device and the bending device are reasonable in structure and save the space, the whole electric toothbrush is easily put in the mouth, and the toothbrush head is convenient to replace.