The invention belongs to the field of oil-gas field exploration and development and relates to a pressure liquid nitrogen continuous liquid-supply low-pressure manifold device. In the pressure liquid nitrogen continuous liquid-supply low-pressure manifold device, aiming at the problems such as low safety of low-pressure flow of large-scale liquid nitrogen construction, disordered field of large-scale construction liquid nitrogen equipment, and potential safety hazard of switched liquid nitrogen storage and transport equipment, a standard and ordered technical norm of a large liquid nitrogen construction field is formed through an innovative low-pressure flow of liquid nitrogen construction, the problems such as low safety of liquid nitrogen construction field, disordered field equipment, discontinuous construction caused by the switched liquid nitrogen storage and transport equipment and potential safety hazard are solved, the resources are reasonably utilized, the construction time is shortened, and the construction field is saved; and moreover, the device has the characteristics of safety, standardization, reasonability, convenience, reliability and the like, can effectively solve the problems such as pressure control in a liquid nitrogen construction process, liquid nitrogen cleaning and filtration and free switching of liquid nitrogen gates, greatly reduces the risks of construction operation and meets the HSE operation requirements of the construction field.