Construction method for replacing and filling graded broken stone on pipeline foundation

The construction method comprises the steps that a sieve plate, traction devices and a suction pump are prepared, the traction devices are divided into two sets, the two sides of the sieve plate correspond to the two sets of traction devices correspondingly, traction ropes of the traction devices are connected with one side of the corresponding sieve plate, and a suction pipe opening of the suction pump is formed in the surface of the sieve plate; sinking the sieve plate to the bottom of the foundation pit; rock blocks are laid at the bottom of a foundation pit, the rock blocks cover suction pipes on the surface of a sieve plate, a traction device is started while a suction pump is started, under the driving of the traction device and the suction effect of the suction pump, the sieve plate moves left and right in a reciprocating mode, the suction pipes of the suction pump move left and right in a reciprocating mode along with the sieve plate, and sludge in gaps of the rock blocks can be sucked; meanwhile, the