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The magnetic properties and magnetocaloric effect (MCE) in EuTi1-xCoxO3 (x =0,0.025,0.05,0.075,0.1) compounds have been investigated.When the Ti4+ ions were substituted by Co2+ ions,the delicate balance was changed between antiferromagnetic (AFM) and ferromagnetic (FM) phases in the EuTiO3 compound.In EuTi1-xCoxO3 system,a giant reversible MCE and large refrigerant capacity (RC) were observed without hysteresis.The values of-ΔSMaxM were evaluated to be around 10 J.kg-1.K-1 for EuTio.95 C00.05O3 under a magnetic field change of 10 kOe.The giant reversible MCE and large RC suggests that EuTi1-xCoxO3 series could be considered as good candidate materials for low-temperature and low-field magnetic refrigerant.