The invention discloses a liquid hydrogen production line comprising a hydrogen intensively-containing grid charging workshop, a hydrogen processing workshop and a liquid hydrogen storing workshop. Ahydrogen purifier, a hydrogen filter, a first heat exchanger group, a second heat exchanger group, a circulating hydrogen low-pressure compressor, a circulating hydrogen high-pressure compressor, a circulating hydrogen purifier, a circulating hydrogen filter, a first circulating hydrogen expansion unit, a second circulating hydrogen expansion unit, a nitrogen compressor, a liquid nitrogen air preheater, a liquid hydrogen storage tank, an ice maker system, a cold box vacuum system, a diffusing device and an electric heater are arranged in the hydrogen processing workshop. A liquid hydrogen pump, a liquid hydrogen storage tank, a liquid hydrogen truck-loading arm, a liquid hydrogen tank box, a BOGC compressor and a BOG air pre-heater are arranged in the liquid hydrogen storage workshop. Theliquid hydrogen production line is high in production efficiency and low in production cost.