High-power diode-pumped solid-state laser (DPSSL) can support many important applications owing to its simple setup and high efficiency. However, the thermal effect in laser crystal is a major limiting factor for laser power improvement. Here, we originally present a quasi-continuous-wave (QCW) diode-pumped monolithic Yb3+-doped YCa4O(BO3)3 (Yb:YCOB) laser and realize the power-scaling at room temperature by removing the heat efficiently. The Yb:YCOB laser at 1024 nm is designed with a quantum efficiency of 95%. A high-power QCW laser is realized with the output peak power up to 226.7 W, a pulse energy of 12.2 mJ, and an optical-to-optical efficiency of 41.2%. To the best of our knowledge, this result represents the record peak power in Yb:YCOB lasers and should have promising applications in some modern devices requiring high-power and large-energy laser.