The invention provides a feeding device applied to conveying a crayon container on crayon assembly lines in various specifications. The feeding device is composed of a width-adjustable hopper, a material distribution mechanism and a screening mechanism, wherein a pair of side plates of the width-adjustable hopper are opposite to each other left and right and arranged in parallel to form a vertically through crayon container feeding cavity, and the whole crayon container feeding cavity is fixedly arranged on a pair of fixing plates of the screening mechanism through a plurality of polished shafts and suspended above a base plate of the material distribution mechanism. The material distribution mechanism is used for realizing material distribution through linear reciprocating movement of a pushing plate in a material pushing unit. The screening mechanism is driven by a driving motor to rotate, and a rotary table pulls the width-adjustable hopper fixed to the pair of fixing plates to conduct forward and backward reciprocating screening through a swing rod. According to the device, automatic positioning, automatic material distribution and automatic feeding of the crayon container canbe realized, and the assembly and feeding efficiency of the crayon container is improved.