A portable rock structure surface direct shearing tester effectively solves the problems of bulkiness, long test time, large cost, long working period and difficulty in operation of apparatuses, adopts the lever principle to avoid adoption of a hydraulic device, and adopts rocks as a main test target. The tester has the advantages of realization of direct shearing test of a rock structure surface, simplicity, easiness in implementation, convenience in operation, short test cycle and low cost. The tester comprises a platform, a loading rate protection device, a shearing rate loader, a sensor fixing rack, a normal displacement sensor, a line, a normal displacement sensor line, a shearing strain sensor, a load sensor line, a pressurization crossbeam, a force transmission plate, a shearing box, a shearing box upper disc, a shearing box lower disc, a rock sample, a rock sample upper disc, a rock sample lower disc, a structure surface, rollers, a load sensor, a rear butting seat, a lever adjusting shaft, a balance weight, a lever part, a counterweight, a hook, a support, a shearing displacement sensor, a force transmission rack, a collecting system, a collecting device and a pinhole.