The invention provides a light truck engine rear bearing device. A bearing frame is composed of a bearing cross beam and two vertical bearing plates symmetrically welded to the left end and the right end of the lower portion of the bearing cross beam. A lower bearing rack is composed of a lower bearing plate and three triangular reinforcing plates welded to the lower bearing plate. The lower bearing rack is welded to the front end face of the middle of an engine rear bearing frame cross beam. The engine rear bearing frame cross beam is riveted to a left frame longeron and a right frame longeron. Support frames are installed on the two sides of a transmission shell of an engine and transmission integrated part in a connected mode. Two buffer rubber mats are arranged on the upper plane of the lower bearing rack, an engine, transmission and support frame integrated part is hoisted, upper cross beams of the support frames are arranged on the two buffer rubber mats, and the support frames and the lower bearing rack are connected through bolts and nuts. By means of the rear supporting device, the use reliability of a truck is greatly improved, and the service life of engine bearing relevant parts is greatly prolonged. The light truck engine rear bearing device is simple in structure and can be widely applied to the light truck.