Guided-wave-based structural health monitoring (SHM) technology is of great importance for real-time inspection of high-temperature structures. The fundamental shear horizontal (SH₀) wave is believed to be an ideal wave mode for developing SHM systems due to its nondispersive characteristics. However, currently very limited SH₀ wave transducers can be used for SHM of high-temperature structures due to the limitation of materials. Herein, a novel YSr₃(PO₄)₃ (YSP) piezoelectric crystal in the space group I43d was grown. Experiments show that the face-shear piezoelectric coefficient d₁₄ (d₁₄ = d₂₅ = d₃₆) is 9.7 pC/N and varies little from 25 to 800 °C. Then a beam-focused SH₀ wave piezoelectric transducer is developed based on face-shear-mode YSP wafers. Both finite element simulations and experimental results indicate that the YSP-based transducer can excite pure SH₀ wave and focus the wave energy along two opposite main directions. Especially, the obtained SH₀ wave beam is highly concentrated with a small divergence angle of less than 30°, originating from the high working frequency range from 300 to 400 kHz. The excellent temperature stability of the as-grown YSP crystal makes the proposed SH₀ wave piezoelectric transducer very suitable for SHM of high-temperature structures.