Sustained-release coating device for fertilizer containing humic acid

The utility model relates to a slow-release coating device for a humic acid-containing fertilizer, which is characterized in that the lower part of a humic acid pellet blanking hopper (1) is connected with a humic acid infiltration blanking machine (2), and the humic acid infiltration blanking machine (2) moves back and forth along a humic acid infiltration blanking machine translation track (3) mounted on a drying box body (5) under the control of a driving motor; more than two spring blanking holes (4) are formed in the surface of the upper part of the drying box body (5), the front part of the drying box body (5) is provided with an oppositely-opened drying box body retractable door (6) through a sliding rail, more than two powder coating devices (8) are arranged in the drying box body (5) side by side, and each powder coating device (8) corresponds to one humic acid pellet blanking groove (9); the lower end of the humic acid pellet discharging groove (9) is aligned to the powder coating device (8), and th