Circuit board testing machine with limiting structure

The utility model discloses a circuit board testing machine with a limiting structure, which comprises a shell and a testing mechanism, and the top of the shell is provided with the testing mechanism. The left end of the electric telescopic rod is connected with the output end of the motor, the right end of the electric telescopic rod is in key connection with a first gear, the bottom of the first gear is meshed with a second gear, the middle of the second gear is in key connection with the left end of a threaded rod, and the two ends of the threaded rod are rotationally arranged in the shell through bearings. The circuit board testing machine with the limiting structure is provided with the threaded rod, the output end of the motor rotates to drive the first gear to rotate, then the first gear drives the threaded rod to rotate through the second gear, and then the threaded rod rotates to drive the adjustment of the distance between the placement plates. And therefore, the placement plate can be limited accor