The utility model relates to a four-channel hydraulic testing
machine, which belongs to the technical field of fatigue test devices and comprises a base, a door-type frame is mounted on the base, and a vertical
actuator is hung on the door-type frame. A transverse
actuator mounting seat and a longitudinal
actuator mounting seat are fixed on the base, a transverse actuator is mounted on the transverse actuator mounting seat, and a longitudinal actuator is mounted on the longitudinal actuator mounting seat; an auxiliary
workbench is installed on the base, and a plurality of sliding seats are arranged on the auxiliary
workbench in a sliding mode. The four-channel hydraulic testing
machine further comprises a testing pressure seat, and the testing pressure seat is movably connected with the vertical actuator, the transverse actuator and the longitudinal actuator. A clamping seat is connected below the test pressure seat; according to the utility model,
dynamic loading in three directions can be carried out on the to-be-detected piece through the vertical actuator, the transverse actuator and the longitudinal actuator, the real stress condition of a plate spring and a guide arm in the automobile driving process is simulated, the structure is innovative and prominent, and
servo control and module measurement are accurate.