A flying probe tester comprises a substrate, two parallel X-axes, two Y-axes and two Z-axes. Each X-axis comprises a first guide rail, two first motors and two first screw, the two first screws are parallel with the first guide rail, the two first motors are located at one ends, which are relatively distant, of the two first screws, and a drive shaft of each first motor is coaxially connected with the corresponding first screw. Each Y-axis comprises a second guide rail, two connecting plates and two first slider, two ends of the second guide rail are fixedly connected with the two connecting plates respectively, the two first sliders are fixed on two surfaces, opposite to the second guide rail, of the two connecting plates respectively, the first sliders can slide along the first guide rail, and the first screws penetrate through the first sliders. The two Z-axes are disposed on the two Y-axes. One first slider, close to the corresponding first motor, of each Y-axis is provided with a screw hole connected with the corresponding screw in a threaded manner, and the other first slider is provided with a guide hole allowing for penetration of the corresponding screw. The flying probe tester is low in cost and high in motion precision.