We report muon spin rotation (mu SR) and magnetization measurements on superconducting Sr2VO3FeAs under pressure. At ambient pressure, Sr2VO3FeAs undergoes an antiferromagnetic transition of the V moments at T-N and becomes superconducting at T-c < T-N. As a function of pressure, T-N initially decreases while T-c increases. Surprisingly, once T-N approximate to T-c at 0.6 GPa, T-N reverses its trend and increases together with T-c, which might indicate a cooperative coupling of the superconducting and the magnetic order.