The invention relates to a small-size circulating cooling instrument for a chemical experiment. The small-size circulating cooling instrument comprises a shell, a semiconductor refrigeration device, arefrigeration circulating device, a heat radiation circulating device, heat radiation devices and a switching power supply, wherein the semiconductor refrigeration device, the refrigeration circulating device, the heat radiation circulating device, the heat radiation devices and the switching power supply are mounted in the shell. One side of the cold end in the semiconductor refrigeration deviceis connected with a water inlet pipe, and the other side of the cold end is connected with the refrigeration circulating device through a water receiving pipe. The refrigeration circulating device isconnected with a water outlet pipe. The heat end of the semiconductor refrigeration device is connected with the heat radiation circulating device and the heat radiation devices in series through a circulating water pipe. The switching power supply supplies power to inner equipment. Through the above detailed design, the small-size circulating cooling instrument has high universality and can participate in various distillation experiments, meanwhile, hydroelectric resources are saved, the effect of experiments of teachers and students is improved, and experiment time is saved; and the small-size circulating cooling instrument has the advantages that the distillation effect is good, the manufacturing cost is relatively low, power consumption is low, the size is small, the weight is small,mobility is good, refrigeration is rapid, and the instrument can be independently collocated for each experiment group to be used.