Foldable car body device

The invention relates to a foldable car body device. The foldable car body device comprises a front frame assembly, a rear frame assembly, a left side beam assembly and a right side beam assembly. The front frame assembly comprises a front plate, a left front stand column, a right front stand column and an air cylinder base fixing part. The rear frame assembly comprises a rear left stand column, a rear right stand column, a rear beam and an air cylinder base, the left side beam assembly comprises a first side beam and a second side beam, and the right side beam assembly comprises a first side beam and a second side beam. A front wheel is arranged at the lower end of the right front stand column, and the lower end of the left front stand column is detachably provided with a front foot sleeve. A rear wheel is arranged at the lower end of the rear right stand column, and the lower end of the rear left stand column is detachably provided with a rear foot sleeve. The foldable car body device is low in packaging and transporting cost and convenient and fast to install for a customer.