Abstract: A method for producing a polyolefin sheet, the method including a step A of applying an organic solvent containing a metal catalyst onto an inner wall surface of a container, and a step B of synthesizing a polyolefin on the inner wall surface of the container by introducing an olefin monomer into the container, in which the organic solvent containing a metal catalyst has been applied onto the inner wall surface, wherein, in the step A, the organic solvent containing a metal catalyst is applied onto the inner wall surface of the container by moving the container, and an ultra-high molecular weight polyethylene sheet.