The invention relates to a self-balancing foundation load test device, comprising a counter force system, an actuating system and a test system, wherein the counter force system comprises a counter force frame, a counter force anchor rod and a counter force anchor blade; the actuating system comprises a jack and a dowel bar; the test system comprises a stress meter, a dial indicator and a spiral test board; the upper end of the counter force anchor rod is blocked in the counter force frame, the exterior of the counter force anchor rod is provided with the counter force anchor blade, the dowelbar penetrates into the counter force anchor rod, wherein the two ends of the dowel bar extend out of the counter force anchor rod, the exterior of the lower end of the dowel bar is provided with thespiral test board, the upper end face of the dowel bar is connected with the jack, the upper part of the jack is provided with the stress meter, and the upper end of the stress meter is against onto a top plate inside the counter force frame; and the dial indicator is placed at the top of the dowel bar by virtue of a measuring support. By utilizing the self-balancing foundation load test device provided by the invention, multiple load tests in different depths can be carried out at the same plane position, the structure is simple, the operation is easy, and the working efficiency is high. In the invention, a self-balancing counter force system is adopted, and the expenditure cost is reduced or completely saved. The test device provided by the invention is light in weight and is convenientto carry.