The invention relates to a hydraulic lock. The hydraulic lock comprises a valve body, a first one-way valve, a second one-way valve and a control piston. A press-guiding cavity is formed in the valve body, the control piston divides the press-guiding cavity into a left press-guiding cavity and a right press-guiding cavity, inlets of the first one-way valve and the second one-way valve communicate with the left press-guiding cavity and the right press-guiding cavity correspondingly, and a left push rod and a right push rod are arranged at the left end and the right end of the control piston correspondingly; a first oil mouth and a second oil mouth of the valve body communicate with the left press-guiding cavity and the right press-guiding cavity correspondingly, a third oil mouth and a fourth oil mouth communicate with outlets of the first one-way valve and the second one-way valve correspondingly, and a pressure-leading-out port communicates with the middle of the press-guiding cavity; when the control piston moves leftwards to a preset position, the left push rod opens the first one-way valve, and the pressure-leading-out port communicates with the right press-guiding cavity; and when the control piston moves rightwards to be close to a preset position, the right push rod opens the second one-way valve, and the pressure-leading-out port communicates with the left press-guiding cavity. According to the hydraulic lock, the situation that the work loading pressure of the overlap-type hydraulic lock is directly led out is achieved, and processing and manufacturing and assembling are facilitated.