The present invention refers to a pushing device of a drawer type magazine apparatus, especially for use with nail guns, in which the magazine apparatus is coupled to a barrel and includes a magazine unit. The magazine unit is equipped with a fixed magazine and a removable nail loading assembly, which cooperates with a pushing device and a nail pusher. The pushing device is equipped with an accommodating member and a spiral spring, by means of the cooperation of the accommodating member and the spiral spring of the pushing device and the nail pusher, the nails can be pushed precisely and stably with an average thrust, so that the situation of nails slanting or getting nails stuck will not happen. The objectives of promoting the convenience for operators and providing durable nail guns are achieved.