Aiming at improving the low data transmission bandwidth and the small storage capacity of the simulator devices of the current satellite data transmission baseband, a kind of simulator based on serial advanced technology attachment 3.0 (SATA3.0) controller and 16-channel TLK2711 interface is invented. Field programmable gate array (FPGA) is used as the main controller of the simulator. And 8 SATA3.0 controllers are built inside it to complete the readout of high-speed data. The high-speed transceiver inside FPGA is used to realize the timing of TLK2711 interface. It greatly reduces the use of IO resources. The experimental results show that the simulator can realize the transmission of 16 TLK2711 interfaces, the data storage capacity can reach 16 TB, and the total transmission bandwidth can reach up to 32 Gb/s. Besides, the line rate of TLK2711 interface based on the high-speed transceiver can be dynamically adjusted from 1.6 Gb/s to 2.5 Gb/s. The simulator has been successfully applied to tests of many kinds of digital transmission subsystems. It has been proved to be stable and reliable and provides a guarantee for tests during the invention of the digital transmission subsystems.