The invention relates to a multi-secondary reflection tower-confocal solar photothermal mirror field system. The system consists of multiple mirror field combination modules and a heat absorber; each mirror field combination module consists of a mirror field and a secondary reflection tower; the mirror fields gather secondary reflection light rays into the heat absorber near the ground through secondary reflecting mirrors in the secondary reflection towers; the mirror fields are elliptical mirror fields or rhombic mirror fields formed by multiple heliostats; and the mirror field combination modules are tightly arranged. The system is reasonable in design, only selects an area with the highest cosine efficiency of north mirror fields, improves the optical efficiency to the greatest extent, saves the number of the heliostats under the same scale, largely reduces the unit cost of a power station, adopts the narrow and long elliptical or rhombic single-side mirror fields, is more flexible in modular combination policy of the mirror fields, and largely reduces the earth waste.