The compact horizontal fire pump unit equipped with a pressure tank adopts the integrated design of horizontal centrifugal fire pump, pressure tank, intelligent control cabinet and automatic pressure monitoring system. It has the advantages of constant pressure water supply, automatic start and stop, energy-saving operation, stable pressure, compact installation, convenient maintenance and high reliability. It is widely used in automatic sprinkler systems, fire hydrant systems, high-rise buildings, commercial complexes, hospitals, schools and industrial fire protection projects, providing efficient, stable and intelligent pressure maintenance solutions for modern fire water supply systems.