Portable device for simulating and measuring starting pressure and using method

The invention discloses a portable device for simulating and measuring starting pressure and a using method. An air supply port of a nitrogen gas cylinder is communicated with the front end of a transparent pipe through a first pipeline, and the first pipeline is provided with a pressure regulating valve and a pressure gauge. A rubber sleeve is disposed in the transparent pipe, an annular cavity is reserved between the transparent pipe and the rubber sleeve, a rock core and a rock core abutting column for causing the rock core to abut against the front end of the transparent pipe are arrangedin the rubber sleeve, a fluid pipe for liquid to pass is disposed in the rock core abutting column, and the fluid pipe is sequentially connected with a second pipeline and a liquid collecting bottle.A submersible pump is disposed in a first container, the submersible pump is connected with the transparent pipe through a first flow regulating valve, and when the first flow regulating valve is switched on, the submersible p