The invention discloses a method for spraying tin on a pole plate, belonging to the technical field of grid manufacturing. The method comprises the following steps: step 1, putting a heating barrel ina storage barrel and putting tin blocks into the heating barrel; step 2, starting a first motor to drive the rotation of the heating barrel and adjusting temperature; step 3, putting liquid tin intothe storage barrel, starting a second motor to drive synchronous rotation of the storage barrel with the heating barrel, and beginning conveying of the grid via a conveyor belt; step 4, when the gridis conveyed to the storage barrel, subjecting the grid to blowing for dusting; step 5, after blowing dusting of the grid, pressing liquid tin out along with brush hair in virtue of pressure formed ina tin brush, and evenly spraying tin on the grid by using the brush hair; and step 6, after uniform spraying of tin on the grid, pressing the liquid tin on the grid via the storage barrel, and then carrying the grid away via the conveyor belt to complete tin spraying. According to the invention, is heating is carried out during tin spraying on the grid, so liquid tin is prevented from solidification and uniform tin spraying on the grid is guaranteed.