Abstract: This disclosure describes an in-situ surrounding rock testing device and method. The testing device includes a collection device and a control terminal. The collection device includes a pressure cell, displacement meters and a magnetic base. When mechanical properties of surrounding rock are tested, the collection device is only necessary to be installed on an outer surface of a gripper of a TBM. The outer surface of the gripper is coupled to a rear end surface of the magnetic base; a front end surface of the pressure cell and displacement meters are in contact with the surrounding rock. The pressure cell measures pressures undergone by the surrounding rock. The displacement meters measure a total compaction displacement of the surrounding rock relative to the collection device. A pressure-displacement curve of the surrounding rock can be obtained by the testing device while pressing the gripper tightly against the surrounding rock.