In order to meet the control requirement of multi-channel synchronous drive of frequency sweep light source in SS-OCT system, a frequency sweep light source control system based on FPGA as the main control unit is developed. The system uses Xilinx XC7A100T chip to design the main control module, five enhanced Howland current sources with buffer feedback to design the laser drive module, ADN8834 chip to control TEC to design the laser temperature control module, and host computer software to carry out human-computer interaction. Finally, the "wavelength-current" query table is made through the wavelength output automatic test experiment, and the automatic continuous linear output experiment is carried out by calling the "wavelength-current" query table. The system shows the control effect of 1nm control accuracy in the full wavelength range of the laser and 0.01 nm control accuracy in any wavelength range, which can be used for reference in the field of integrated control of frequency sweep light source of SS-OCT.