The invention provides a tower-type solar condensation system and a condensation method. The tower-type solar condensation system comprises a heliostat array, an absorption tower and a cavity heat absorber, wherein the heliostat array is arranged in a heliostat site in a sector shape by taking the absorption tower as the center of a circle; the cavity heat absorber is mounted on the top end of the absorption tower through a rotating control mechanism. The tower-type solar condensation system has the advantages that firstly, the arrangement range of the heliostat array is enlarged, on the basis of the north side mirror site of an original absorption tower, the arrangement range of heliostats is enlarged to the east side and the west side of the absorption tower, and thus the solar energy that the heliostats can radiate is improved; secondly, the cavity heat absorber mounted on the top of the absorption tower can rotate, so that the opening direction of the cavity heat absorber is the same as the energy focus reflected by the heliostats, and thus the energy utilization rate is improved; (3) the current solar azimuth can be accurately calculated, and thus the angles of the heliostats are the same as the current solar azimuth, and the solar energy that the heliostats can radiate is improved.