The invention discloses a miniature jaw crusher. The miniature jaw crusher comprises a miniature jaw crusher body and a monitoring system, wherein the miniature jaw crusher body comprises a machine body (3), a flywheel (11) and a belt pulley (15); the flywheel (11) and the belt pulley (15) are assembled with a camshaft (14) of the machine body (3) in a normally and reversely threaded manner; the monitoring system comprises a strain sensor (6) arranged on a bearing block (2) of the machine body (3); and the strain sensor (6) is connected with a signal processor (8) through a signal line (7), carries out processing and controlling through a computer (9). By the miniature jaw crusher, the problem that threaded assembly of the jaw crusher is locked automatically and continuously and is not easy to detach can be solved effectively, the jaw crusher can be detached conveniently, meanwhile, impact load in a crushing operation process can be monitored indirectly, particularly, the miniature jaw crusher can be detached conveniently after components of the miniature jaw crusher are locked in a threaded manner, and working condition maintenance of the miniature jaw crusher can also be implemented.