The invention relates to a single-power-source high-low-pressure self-adaptive high-precision dynamic and 
static loading test 
system which comprises a counter-force frame, a dynamic and static composite loading oil cylinder, a pressure-bearing jacking cover, a driving oil cylinder, a connecting rod, a 
power module and an 
oil tank. All parts of the counter-force frame are connected through 
mortise and tenon structures, borne acting force can be converted into pulling force of the front plate and the rear plate, and ultrahigh counter-force bearing is achieved. A return 
stroke cavity, an 
oil pressure cavity and an 
energy storage cavity are sequentially formed in the inner space of a cylinder body of the dynamic and static combined loading oil cylinder, a hollow loading rod is arranged in the cylinder body, an 
impact rod is movably arranged in the hollow loading rod, and combined loading of dynamic load, static load and disturbance load of different strain rates can be achieved. The 
power module comprises a sliding rail block, a wave tooth, a lead screw fixing 
flange, a lead screw and a 
servo motor, torque generated by the 
servo motor can be converted into vertical movement and 
vertical force of the lead screw, and original power is provided for the whole 
system. The vertical movement of the 
power module can realize high-precision minimum static load loading; the power module is matched with the dynamic and static combined loading oil cylinder, so that high-precision super-large 
static loading and dynamic and static 
coupling loading can be realized. According to the test device, 
random switching between high-precision extremely-small static load and dynamic load 
coupling loading and high-precision ultra-large static load and dynamic load 
coupling loading can be achieved by means of a single power source.