As optical parametric chirped pulse amplification (OPCPA) has been widely adopted for the generation of extreme intensity laser sources, nonlinear crystals of large aperture are demanded for high energy amplifiers. Yttrium calcium oxyborate (YCa4O(BO3)3, YCOB) is capable to be grown with aperture exceeding hundred millimeters, which makes it possible for application in systems of petawatt scale. In this paper, we experimentally demonstrated for the first time to our knowledge, an ultra-broadband non-collinear optical parametric amplifier with YCOB for petawatt scale compressed pulse generation at 800 nm. Based on SG-Ⅱ 5PW facility, amplified signal energy of ~40 J was achieved and pump-to-signal conversion efficiency was up to 42.3%. A gain bandwidth of 87 nm was realized and supported compressed pulse duration of 22.3 fs. The near field and wavefront aberration represented excellent characteristics which were comparable with those achieved in LBO-based amplifier. Those results verified YCOB great potential utilization in future.