The invention provides a self-operated control type low-pressure normally-open structure for pressure reduction, and belongs to the technical field of adjusting and controlling devices. The self-operated control type low-pressure normally-open structure for pressure reduction comprises a filter, a pressure reducing valve and a low-pressure normal open valve. According to the self-operated controltype low-pressure normally-open structure for pressure reduction, the filter is arranged, so that blockage of the pressure reducing valve and the low-pressure normal open valve is prevented, meanwhile, impurities can be filtered, and the fluid with higher cleanliness is provided; the pressure reducing valve and the low-pressure normally-open valve can be arranged in parallel, so that when upstreampressure is large, the pressure reducing valve can be opened, the low-pressure normal open valve can be closed, and the pressure reduction and supply of the fluid are realized; when the pressure reducing valve cannot be opened under the condition that the upstream pressure is small, the low-pressure normal open valve is opened, the supply of the fluid can also be realized; and the adaptability ishigher, so that normal proceeding of people in production and life is guaranteed, the influence on the production and life of people is avoided, and supportability of the self-operated structure is higher.