Hydraulic pushing device and logging instrument

The invention provides a hydraulic pushing device and a logging instrument. The hydraulic pushing device comprises a base body and a pushing mechanism arranged on the base body, wherein the pushing mechanism comprises pushing arms and a piston assembly, the piston assembly comprises a piston and a piston rod, the piston is arranged in a cavity arranged in the base body in a sliding manner, the cavity is divided into a first cavity and a second cavity by the piston, one end of the piston rod is connected with the piston, the other end of the piston rod is connected with the pushing arms after extending out of the first cavity, and the piston rod moves to and from under hydraulic action and drives the pushing arms to move together or outwards. According to the hydraulic pushing device of theapplication, pushing force is controlled by hydraulic force, and large pushing force pushing can be realized; and besides, under the condition of the plurality of pushing arms, independent hydrauliccontrol can be realized ov