The invention discloses a digital fatigue impact test instrument and a test method, comprising a guide rail, a guide rail support frame, a specimen fixture, an impact hammer head, a light shield, an acceleration sensor, a force sensor, a photoelectric sensor, a cylinder control valve, a cylinder, and an electromagnet , travel switch and computer. When the impact hammer head descends from a height along the linear guide rail to impact the test specimen, the data acquisition card records the experimental data of the impact process, and under the action of the cylinder and the electromagnet, the impact hammer head can rise to the set position to prepare for the next impact. The instrument can not only control the number of impacts and collect sensor data during the impact process, but also obtain the impact contact force, impact energy, impact time, acceleration, displacement, and velocity in each impact process. The relationship between the changes in the physical quantities involved , to realize the automation, continuous and full digitalization of the fatigue impact process, which is of great significance to the accurate simulation, design and failure mechanism exploration of the material impact resistance process.