A manufacturing method of a recycled plate for a sliding nozzle, the method comprising performing, on a plate after having been used for the sliding nozzle, recycling processing including: impregnating a matrix of the plate that is formed by a refractory brick and has a through-hole with liquid containing at least one of tar and pitch; heating the plate impregnated with the liquid to a baking temperature of 200°C to 400°C and a caulking temperature of 500°C to 700°C to remove a volatile component; cutting a peripheral edge of the through-hole of the plate after having been impregnated with the liquid and heated, and filling a recess having an opening width and a depth of equal to or smaller than 1 mm, which is present on a surface of the plate having the through-hole of which peripheral edge has been cut, with a thermal expandable refractory material of which volume is increased by at least one of generation reaction and change in a crystal structure with heating when the plate attached to the sliding nozzle that performs discharge control and flow control of molten steel in a steel manufacturing process is used, wherein the thermal expandable refractory material is selected from the group consisting of: a first material obtained by kneading a refractory material containing raw materials with which ceramics having a lower density than the raw materials is synthesized with heating with a liquid medium comprising water or organic solvent, wherein the raw materials comprise metal oxides having average particle diameters of 0.1 μm to 20 μm obtained as a diffraction scattering diameter by a laser diffraction scattering method, a second material obtained by kneading a refractory material containing metallic powder with which metal oxide is generated by oxidization with heating with the liquid medium, and a third material obtained by kneading a refractory material containing fine quartz powder with the liquid medium, wherein cristobalite is precipitated from the fine quartz and cristobalite transformation accompanied by a volume increase occurs with heating. impregnating a matrix of the plate that is formed by a refractory brick and has a through-hole with liquid containing at least one of tar and pitch; heating the plate impregnated with the liquid to a baking temperature of 200°C to 400°C and a caulking temperature of 500°C to 700°C to remove a volatile component; cutting a peripheral edge of the through-hole of the plate after having been impregnated with the liquid and heated, and filling a recess having an opening width and a depth of equal to or smaller than 1 mm, which is present on a surface of the plate having the through-hole of which peripheral edge has been cut, with a thermal expandable refractory material of which volume is increased by at least one of generation reaction and change in a crystal structure with heating when the plate attached to the sliding nozzle that performs discharge control and flow control of molten steel in a steel manufacturing process is used, wherein the thermal expandable refractory material is selected from the group consisting of: a first material obtained by kneading a refractory material containing raw materials with which ceramics having a lower density than the raw materials is synthesized with heating with a liquid medium comprising water or organic solvent, wherein the raw materials comprise metal oxides having average particle diameters of 0.1 μm to 20 μm obtained as a diffraction scattering diameter by a laser diffraction scattering method, a second material obtained by kneading a refractory material containing metallic powder with which metal oxide is generated by oxidization with heating with the liquid medium, and a third material obtained by kneading a refractory material containing fine quartz powder with the liquid medium, wherein cristobalite is precipitated from the fine quartz and cristobalite transformation accompanied by a volume increase occurs with heating.