Metal plate mortise and tenon splicing lathe bed

A metal plate mortise and tenon splicing lathe bed comprises a working table top, supporting legs arranged on the two sides of the bottom of the working table top and a cross beam arranged between the two supporting legs. The working table top is formed by splicing a plurality of table top units, the supporting legs comprise an outer sealing plate, an inner sealing plate, a top sealing plate, a bottom sealing plate, a front sealing plate and a rear sealing plate, and the outer sealing plate, the inner sealing plate, the top sealing plate, the bottom sealing plate, the front sealing plate and the rear sealing plate define a box type structure; the cross beam is of a hollow structure and is formed by splicing and welding metal plates, a through hole is formed in the position, corresponding to the cross beam, of the inner side plate, and the end of the cross beam extends into the through hole. All the parts are spliced through the mortise and tenon structures, the welding workload is reduced, and therefore the w