The invention relates to the technical field of land renovation engineering and in particular relates to an urban sludge marginal land renovation method. The method comprises the following steps of tidying and cleaning land surface of the marginal land, paving urban dehydrated sludge on the marginal land, paving modifiers on the urban dehydrated sludge, mixing the paved urban dehydrated sludge and the modifiers and then conducting rotary ploughing, and paving alien soil on the mixed and rotary-ploughed urban dehydrated sludge and modifiers. A plantation method to solve problems of barren marginal land soil and thin soil layer is developed and artificial soil with certain thickness and containing fertility is formed; low soil modifying cost and great effect are achieved; plant growth can be met; urban sludge processing modes can be eliminated; and resource and environment circulation utilization can be achieved.