The invention discloses a manufacturing method of a crib. The manufacturing method includes the following steps that corresponding molds are designed according to components of the crib, the components of the crib comprise two side bars, two bedsides and a bed board, the components are arranged linearly, the molds are opened, the temperature of the molds ranges from 25 DEG C to 35 DEG C, the raw materials are injected into the molds, the molds are combined and stand still for 9 minutes to 11 minutes, then the molds are opened, the components, formed in the molds, of the crib are taken out, the two bedsides and the two side bars are fixed through screws, and the crib is obtained after the bed board is mounted. According to the manufacturing method, a wood-imitation material or plastic is adopted, and the crib has the beneficial effects of being free of rust, resistant to corrosion, low in mass, insulating, balanced in density distribution, good in compressive strength, good in dimensional stability, free of cracking, free of maintenance, resistant to flame, free of mildew, long in service life, environment-friendly, free of pollution to the surroundings, free of consumption of a great number of natural resources, good in water resistance and high in safety coefficient.