B+ → pΛ ̄1520 is one of the simplest two-body baryonic B decay modes. Wereconstruct Λ ̄1520 from ̄p and K+, then search for the signal B+ → pΛ1520(→ ppK ̄+). Simulating the data collected at the Υ(4S) resonance with the Belle detector at KEKB, we use Monte Carlo method to generate 772 million BB ̄ pairs collider events. After background suppression, we extract the signal from the Monte Carlo generated data and estimate the branching fraction:B(B+ → pΛ ̄1520) < 5.46 × 10−7 at the 90% confidence level. This study helps measuring the branching fraction of the real data at Belle detector, and further, data at Belle II detector.