The invention relates to the technical field of agricultural machinery, and in particular, relates to a continuous fertilizer applicator. The fertilizer applicator includes a walking device, a soil digging and separating device, a fertilizer discharger, a center controller, a fertilizer application depth positioning device, a fertilizer flow quantity control device, a soil fertilizer content detection device and a fertilizer application point position positioning device. The fertilizer discharger comprises a base, a base height adjusting device and a plurality of fertilizer discharger injection heads arranged below the base in a matrix manner, and each injection head is provided with a fertilizer burying detector; the fertilizer application depth positioning device is located on the base; all the fertilizer burying detectors are connected with the center controller; when a fertilizer burying signal of one injection head is received, the center controller immediately controls the soil fertilizer content detection device to acquire a soil sample below the injection head, then the content of a fertilizer in the soil sample is detected, and the center controller judges a fertilizer application amount condition of the point according to the data and makes additional or excessive records.