The invention discloses a predictive current phase-shifting control method for three-port converter half-switching period sampling. The method comprises the steps of: based on a Y-delta equivalent transformation and current ripple method, calculating the inductor current slope of a converter under different operating conditions; collecting the inductor currents at the zero point time and the midpoint time of each switching cycle, obtaining the inductor current reference value according to the PI controller, and calculating and generating the predicted shift ratio in half of the switching cycle based on the inductor current sampling value and the inductor current reference value, and updating the shift comparison after half of the switching cycle. The invention discloses the predictive current phase-shifting control method suitable for three-port converter half-switching period sampling, which can update the phase shifting ratio in real time according to the reference value of the inductor current and can effectively eliminate the direct current component in the inductor current.