The invention provides an oil port integration zero-leakage mechanical opening pilot-operated type hydraulic lock device. The device comprises a reversing body; a through main valve pipe is installed on the reserving body; a valve rod and a valve rod assembly are installed in the main valve pipe, wherein the valve rod assembly is connected with the valve rod; part of the valve rod assembly extends out of the main valve pipe; the main valve pipe communicates with a middle oil passage of an outer oil inlet body through a middle oil passage; a first oil return passage and a second oil return passage are installed on the two sides of the middle oil passage correspondingly; a valve assembly and a second valve assembly are installed in the first oil return passage and the middle oil passage correspondingly; a plurality of oil passages are installed in the inner wall of the main valve pipe in sequence; and an annular pit is formed in the surface of the valve rod. According to the oil port integration zero-leakage mechanical opening pilot-operated type hydraulic lock device, unlocking control force of the valve rod can be reduced, and a lock can be easily opened without reversed pressure.