A petal-shaped electron irradiation accelerator, recirculating coaxial accelerator (Recotron) was designed by Institute of Modern Physics, Chinese Academy of Sciences. It can produce 10 MeV energy and 10 mA current irradiation electron beam. It is under construction now and expected to become China’s first domestically produced petal-shaped electron irradiation accelerator. To guarantee the radiation safety of this facility during operation and provide a reference for the radiation shielding design of the same type of electron accelerator in the future, a study on radiation shielding for this facility was carried out using Monte Carlo code FLUKA. The proposed vault of the Recotron is a kind of semi-underground structure with the accelerator room above ground and the irradiation room below ground. According to the beam loss characteristic of the Recotron, a simple but effective radiation source input model was proposed for MC simulation. This model fully considered the main beam loss points that determine the radiation field of the Recotron. The results show that to meet the dose criterion of China, the thickness of side walls, ceiling of accelerator room and ceiling of irradiation room should be at 160-220 cm, 110-150 cm, 150 cm respectively, when ordinary concrete was used as the shielding material.