Electrical fault on-line diagnosis device

The utility model relates to the field of electrical fault detection, in particular to an electrical fault online diagnosis device which comprises a fault detection computer body, a fixing block is fixed on one side wall of the fault detection computer body, a groove is formed in the top of the fixing block, a touch screen fingerstall is inserted in the groove, and a supporting plate is connected to the bottom of the fixing block. Electric push rods are fixed to the lower sides of the two side walls of the fixing block, and the tail ends of the electric push rods are fixedly connected with the top of the supporting plate. According to the fault detection computer, the fixing block is fixed on one side wall of the fault detection computer body, and the touch screen fingerstall is arranged in the groove of the fixing block, so that when a fault computer is used for fault detection of an automobile, the touch screen fingerstall is sleeved on a finger, and the fault detection computer body can be operated by usin