The invention relates to a focusing method for a disc-type solar energy collector. The focusing method for the disc-type solar energy collector at present is difficult in operation, low in debugging efficiency and low in focusing accuracy. The focusing method comprises the following steps that a target is installed at a focusing position of a disc face of the disc-type solar energy collector; the disc face of the disc-type solar energy collector comprises a number block reflection panel; the target is of a flat structure, the target is matched with the solar energy collector, a plurality of marks are arranged on one face of the target facing to the disc face, and quantity and distribution modes of the marks are respectively unanimous with the reflection panel of the solar energy collector; the reflection panel disc-type solar energy collector is adjusted to enable the marks on the target to image on the corresponding reflection panel; and each reflection panel is adjusted to enable the marks on the whole target to completely image on the disc face, and focusing work of the disc-type solar energy collector is completed. The focusing method is simple in operation, high in debugging efficiency and high in focusing accuracy.