Wellhead hydraulic sealing device

The invention provides a wellhead hydraulic sealing device, used to seal a sucker rod of a sucker-rod pump. The wellhead hydraulic sealing device comprises a packing chamber arranged on a wellhead of an oil well, sealing packings arranged in the packing chamber, a transmission device connected with the sealing packings, and a driving device connected with the transmission device. The wellhead hydraulic sealing device can conveniently realize remote shut-in well in a certain distance, and can rapidly and effectively complete shut-in well in emergency conditions. The device can be used as secondary sealing when a polish rod sealing packing on a wellhead is changed, and the device improves operation security and working efficiency.