Portable true triaxial apparatus

The invention relates to a portable true triaxial apparatus, which solves the problem that the prior apparatus has the disadvantages of large volume, ponderosity, inconvenient transportation and assembly and single function. A vertical direction loading system is provided with four upright posts (1), the upper end of each vertical post is connected with an upper plate (4), while the lower end is connected with a lower plate (3); a vertical oil cylinder (4) is connected with the upper plate (2);a Y direction loading system is provided with two symmetrical X direction fixtures (5) which are connected with the two upright posts respectively; one fixture is connected with a first horizontal oil cylinder or a pressure sensor (6), and the other fixture is connected with a stress applying handwheel (7); two symmetrical Y direction pull rods (8) are connected with the two upright posts respectively; an X direction loading system is provided with a bottom plate (9) which is positioned on and connected with the lower p