The invention discloses a full-automatic pit digging, fertilization, discharge and planting device. The upper end of a base is connected to an upper seat plate, the bottom surface of the upper seat plate is provided with an auxiliary oil cylinder, the auxiliary oil cylinder is connected to a lifting plate, the center of the lifting plate is provided with a drill bit, the bottom of the lifting plate is provided with a fixed cylinder, a telescopic cylinder is arranged in the fixed cylinder, the upper end surface of the lifting plate is provided with a material storage box, a lower end port of the material storage box is connected to a material guide sleeve, the material guide sleeve sleeves a material scattering box, the material scattering box is provided with a material scattering hole, the material scattering box is fixed in the telescopic cylinder, the drill bit is located in the fixed cylinder, a casing pipe shaft is arranged in the drill bit and is connected to the auxiliary oil cylinder, the auxiliary oil cylinder is connected to the upper seat plate, the casing pipe shaft is arranged in a feeding hopper, a feeding plate is arranged in a discharge pipe, the feeding plate is provided with a material blocking plate, the feeding plate is provided with a sliding hole, the casing pipe shaft is provided with a pull rod, the lower end of the drill bit is provided with an opening / closing head and the base is provided with a work hole passing through the fixed cylinder. The device realizes automatic pit digging, automatic mass planting and automatic soil covering and greatly improves the efficiency of crop planting.