Boiled-off gas recovery system and method based on cold energy utilization in LNG receiving station

The invention relates to a boiled-off gas recovery system based on cold energy utilization in an LNG receiving station. The boiled-off gas recovery system comprises a storage device, an output device arranged in liquid phase space of the storage device, a buffer tank, a high-pressure pump, a BOG supercharging device and a BOG condensing device. A first inlet of the buffer tank is connected with a low-pressure pump. An inlet of the high-pressure pump is connected with an outlet of the buffer tank, and an outlet of the high-pressure pump is connected with a downstream natural gas pipeline network through an LNG high-pressure conveying pipeline, an LNG gasifier and a metering pry. An inlet of the BOG supercharging device communicates with gas phase space of the storage device. An inlet of a high-temperature medium pipe of the BOG condensing device is connected with an outlet of the BOG supercharging device, an outlet of the high-temperature medium pipe is divided into three paths, the first path communicates wit