In this paper, we investigate the block error rate (BLER) performance of short packet communications in wireless energy harvesting relaying networks over Nakagami-m fading channels. We consider an amplify-and-forward (AF) relaying system where the relay node harvests energy and information from the source’s signal using power splitting protocol in the first half phase and then utilizes this amount of harvested energy for data transmission to the destination in the second half phase. We derive closed-form expressions for average system BLER and approximate system BLER. Numerical simulations are provided to validate the accuracy of analytical expressions. The simulation results also offer valuable insights for optimizing system performance in energy-constrained and low-latency applications.