The invention belongs to the field of shower coating operation, and relates to a device for realizing large-scale workpiece station transformation, in particularly to a double-shaft turnover device for the large-scale workpiece station transformation in a non-contact requirement on an outer surface of a large transparent part in a shower coating process. The double-shaft turnover device comprisesa small turnover system, a large turnover system and a bottom rack system; the large turnover system consists of a rotating shaft Y, a chain wheel set A, a set of adjusting wheels A, a chain wheel setB, a set of adjusting wheels B, a rotating frame, a long shaft, bearing blocks, a chain wheel set C and a motor; and the small turnover system is composed of clamping pieces, circular sectional materials, positioning magnetic blocks, a workpiece mounting frame and a rotary shaft X. According to the double-shaft turnover device for large-scale workpiece station transformation, the device can meetthe working condition requirement of coating on the outer surface of the large transparent part, no external object is in contact with the outer surface of the windshield of the transparent part in the whole process, and the three position states can be freely changed; and the large transparent part can be installed in a convex position in combination with manual assistance under the main controlof electric control, and the upright of a specific angle (working position) and the concave displacement can be kept.