The utility model relates to a composite plastic door which is composed of door leaves, a door frame, a door hinge, and filler. The hollow part of the door leaves and the door frame is filled with the filler, for example, the wood powders, the wood shavings, the grass shavings, the bamboo shavings, the paper shavings, the pasty mixture of the foam and the binder, which can increase the strength of the whole door, can resist the impact, and can not easily produce the deformation; when the door is installed, the utility model can be used without adding the wood strip; thereby, the utility model can extend the service life; the utility model not only can be used for the door of the toilet, the utility model can be popularized for being applied to the doors and the windows of the indoor room. The utility model has the advantages of reasonable design, simple structure, lower cost, easy installation, and firm and durable structure. The utility model can not easily be clashed or be crashed.