To reduce the energy consumption of data room, the research was made on the equipment design of thermoelectric power generation technology recovering the low-temperature waste heat. Through experimental research of constructing the small thermoelectric power generation simulation equipment, experimental data were achieved about the short-circuit current, open-circuit voltage and the load power for the thermoelectric modules with different number of thermoelectric generators under different temperature. The analytical result shows that the short-circuit current and open-circuit voltage increased with the increment of temperature difference and numbers of thermoelectric generators connected by the series or parallel ways; Under the condition of low temperature difference, the thermoelectric module inner resistance of the designed small thermoelectric power generation simulation equipment is about 100 without the consideration of contact resistance; The temperature difference from 10 ℃ to 20 ℃ can be used as the thermoelectric generator working temperature of data room to recycle the low-temperature waste heat.