With the development of integration scale, heat dissipation has become a more and more serious problem, which can not be neglected in high density electronic circuits.Although some devices based on the charge and spin thermoelectric effects can be used to solve this problem, the efficiency of these devices is very low.Hence, it is necessary to find high efficient thermoelectric devices.We theoretically investigate the thermoelectric effects in an Aharonov-Bohm ring with a serially coupled double quantum dot embedded in one arm.An external magnetic field is perpendicularly applied to the two dots.Using the nonequilibrium Greens function method in the linear-response regime, we calculate the charge and spin figures of merit.When the energy levels of the two quantum dots are equal and the system is connected to two normal leads, a large spin figure of merit (ZsT≈4.5) accompanying with a small charge figure of merit (ZcT≈0) can be generated due to the remarkable bipolar effect.Further, when the system is connected to two ferromagnetic leads, the spin figure of merit can reach even a higher value about 9.Afterwards, we find that ZsT is enhanced while ZcT is reduced in the coaction of the Aharonov-Bohm flux and Rashba spin-orbit coupling.It is argued that the bipolar effect is positive (negative) to spin (charge) figure of merit in the presence of level detuning of the two quantum dots and intradot Coulomb interactions, respectively.Also, we propose a possible experiment to verify our results.In summary, through our calculation and analysis, it is possible that this serially coupled double quantum dot system may be used as a high efficient spin thermoelectric generator.