The utility model discloses an improved structure of a magnetic type straight combined floor drain. The improved structure comprises a floor drain body and a sealing cover, wherein the middle of the floor drain body is provided with a mounting post through a plurality of connecting strips, a mounting hole is formed in the mounting post, the top of the mounting hole is provided with a top magnetic block, the hole wall of the mounting hole is provided with at least one outer magnetic strip which is in circumferential distribution relative to the center of the mounting hole, the tail end of a guide bar of the sealing cover stretches into the mounting hole, the tail end of the guide bar is provided with at least one inner magnetic strip, the inner magnetic strips and the top magnetic block are different in magnetic pole to be absorbed, and the inner magnetic strips generate an up-shift trend under the push-up magnetic force actions of the top magnetic block and the outer magnetic strips so as to enable the sealing cover on the guide bar to seal a lower outlet of the floor drain body. Through the design, action force applied to the guide bar is gradually increased in the water draining and resetting processes of the sealing cover, so that the centering performance of the guide bar in the resetting process is effectively ensured, the resetting explosive force of the sealing cover is effectively enhanced, and the occurrence of a resetting failure phenomenon of the sealing cover is avoided.