The flow resistance loss equations were built, that of solar power Stirling engine heat exchanger, and internal connection between the working medium speed was determined, mass flow rate and rotation angle, the heat exchanger numerical calculation of dynamic flow resistance loss was carried out, and the relationship was obtained that between different parameters and dynamic flow resistance loss in heat exchanger. Research shows that the mechanical power loss in regenerator, heater and cooler each accounted for 65.5%, 19% and 15.5%.In regenerator the flow resistance loss increase with the rise of screen mesh number, decreases with the rise of mesh porosity. The peak of positive and reverse flow resistance loss in cooler appeared near the angle 100° and 270° respectively, and reverse is greater than the positive. Inside the heater, flow resistance loss curve asymmetry on each side of the horizontal axis, positive and reverse peak at angle 144° and 300° respectively, and positive peak is greater than the reverse. Effect of pipe diameter on the flow resistance loss both in the heater and cooler are more significant.