The invention discloses a seamless butt-joint plate, which comprises a plate body. The seamless butt-joint plate is characterized in that the two sides of the plate body are provided with a strip-shaped inserting groove and an inserting plate matched with the strip-shaped inserting groove correspondingly; a straight chamfered corner is arranged at a groove opening of the strip-shaped inserting groove; the inserting plate is fixed to the side wall of the plate body through a pasting plate; the inserting plate and the pasting plate are integrally formed and are both made of PVC with plasticity;a flexible bonding adhesive is arranged in the strip-shaped inserting groove, and a sealing thin film is connected to the groove opening of the strip-shaped inserting groove; and the sealing thin filmseals and covers the strip-shaped inserting groove into a sealing cavity. Compared with the prior art, the seamless butt-joint plate has the beneficial effects that the design is reasonable, the structure is simple, splicing can be quickly achieved, and no seam exists after splicing; and meanwhile, secondary seam beautifying operation is also not needed, and thus dust is conveniently cleared.