An anti-drawing structure of a support of a straddle rail beam is arranged between an upper support plate and a lower support plate; upper support plate guide plates are perpendicular to upper supportplate anti-drawing plates; the upper support plate guide plates and the upper support plate anti-drawing plates are respectively arranged at the two ends of the upper support plate in the horizontaldirection; lower support plate lugs are respectively arranged at the two ends of the lower support plate in the horizontal direction; rotary sliding blocks are arranged between the lower support platelugs and the upper support plate anti-drawing plates; the lower surfaces of the lower support plate lugs are matched with the upper surfaces of the rotary sliding blocks; the upper surfaces of the upper support plate anti-drawing plates are matched with the lower surfaces of the rotary sliding blocks; and the upper surfaces of the rotary sliding blocks are arc surfaces and the lower surfaces of the rotary sliding blocks are flat surfaces or the lower surfaces of the rotary sliding blocks are arc surfaces and the upper surfaces of the rotary sliding blocks are flat surfaces. By virtue of the rotary sliding blocks, the upper support plate anti-drawing plates and the lower support plate lugs, the anti-drawing structure realizes the large displacement, low friction sliding and anti-drawing function of the support, thereby effectively improving the force-bearing safety and reliability of the structure of the support and the convenience of processing. The anti-drawing structure of the support of the straddle rail beam meets the need for the anti-drawing function of the support of the straddle rail beam.