The utility model provides a compound liquid fertilizer applicator can realize multiple nutrient solution quick replacement's fertilization. Its structure includes: a handle of retaining jar and retaining jar, retaining jar inside are equipped with a plurality of nutrient solution memotrons, and the nutrient solution memotron passes through threaded connection in retaining tank bottoms portion toalong the distribution of circular arc type, the memotron is equipped with different colours in order to distinguish different nutrient solutions, retaining tank bottoms portion still is equipped withthe apopore that quantity equals with the opposite position of memotron. A retaining jar below is equipped with the division board, and the division board top edge is equipped with abrupt circle, andthe ability is coincide with the retaining jar groove phase that the below is marginal to realize that the division board links to each other with the retaining jar, and can the free rotation. Be equipped with two opposite apertures on the division board, and the position of aperture corresponds with the aperture position of retaining in jar.