The invention discloses a rock porosity real-time tester under chemical seepage and creep coupling, belonging to the rock engineering technical field, which is composed of a rock sample clamp, a chemical seepage pressure loading device, an axle pressure loading device, a surrounding pressure loading device and a porosity tester. The rock porosity real-time tester can real-timely test the porosityof a rock sample under constant pressure loading and chemical seepage coupling of three directions, having simple structure, flexible assembly, strong expandability, high stability and wide application. The rock porosity real-time tester has high application value for rock soil mass mechanical property and seepage character research under multi-field coupling condition of rock-soil engineering, hydraulic engineering, petroleum engineering, mining engineering and underground engineering and the like.