The invention belongs to the solar energy utilization device technical field, in particular relating to a sun position follow-up control device. The technical proposal is as follows: the device comprises sensing mechanism formed by a soleplate with certain thickness, a double-layer cross-shaped light barrier arranged on the soleplate and respectively arranged six light sensitive control devices; a sensing signal processing mechanism formed by the light sensitive control devices connected with a data microprocessor by a circuit; and a control mechanism formed by a first drive circuit and a second drive circuit which are connected with a control motor for controlling the horizontal direction and the vertical direction of a solar energy collecting device, wherein, the sensing mechanism forming the sun position follow-up control device consists of the soleplate, the double-layer cross-shaped light barrier and six light sensitive control devices; therefore, the sun position follow-up control device has the advantages of simple structure and low composition cost; in addition, the sun position follow-up control device also has the advantages of high sensitivity and high accuracy of the sensing mechanism.