The utility model belongs to the technical field of railway equipment, and particularly relates to a portable intelligent
diagnostic instrument which comprises a shell, a mainboard, an interface board and a power supply battery are arranged in the shell, and a touch screen is arranged on the front face of the shell. The mainboard comprises a
power supply unit, a core board unit, a network unit, a 4G unit, a positioning unit and an interface unit; the interface board comprises a
power supply unit, a
communication unit, an acquisition unit and an interface unit and is used for connecting external tested equipment; the power supply battery supplies power to the mainboard, the interface board and the touch screen; and the touch screen is connected with the main board and is used for displaying diagnosis information and receiving
user input. According to the portable intelligent
diagnostic instrument, multiple functions, high reliability and strong compatibility of the portable intelligent
diagnostic instrument are realized, and the maintenance efficiency and the diagnosis precision of field equipment are remarkably improved.