Code reading device with automatic positioning function

The invention provides a code reading device with an automatic positioning function. The code reading device comprises a frame body, a three-axis moving mechanism, code scanning equipment, a laser distance measuring sensor and an industrial personal computer, the three-axis moving mechanism is arranged in the frame body, the code scanning device is connected with the three-axis moving mechanism, the laser distance measuring sensor is arranged on the code scanning device, the industrial personal computer is arranged on the frame body, and the three-axis moving mechanism, the code scanning device and the laser distance measuring sensor are connected with the industrial personal computer. The distance between the code scanner and the two-dimensional code is rapidly measured through the laser distance measuring sensor, and the focal length of the code scanner can be automatically adjusted through the movement of the front-back structure, the up-down structure and the left-right structure, so that the spatial posi