Four-axis industrial robot

The invention relates to the field of industrial robots, in particular to a four-axis industrial robot. The four-axis industrial robot comprises a vertically-arranged first-axis rotating assembly, one side of a shell of the first-axis rotating assembly is provided with an electrical connecting wire interface, a cable protective cover is arranged in the shell, and the bottom of the shell is connected with a robot fixing frame; the vertically-arranged two-shaft lifting assembly is connected with the top of the one-shaft rotating assembly and rotates relative to the one-shaft rotating assembly, a two-shaft electrical junction box is arranged on the back of the two-shaft lifting assembly, and a drag chain is arranged above the two-shaft electrical junction box; and the horizontally-arranged three-four-axis rotating assembly is connected with a sliding table module arranged on the front portion of the two-axis lifting assembly and does lifting motion relative to the two-axis lifting assembly, a three-axis electric