Reinforced and stable surfboard tail fin

The reinforced and stable surfboard tail fin comprises a mounting plate, a connecting block and a tail fin body, a mounting groove is formed in the middle of the mounting plate, the connecting block is arranged at the upper end of the mounting groove, connecting sleeves are arranged on the left side and the right side of the mounting groove, and plug pins are arranged at the upper ends of the connecting sleeves; first fixing nails are arranged on the front face and the rear face of the connecting block and the front face and the rear face of the mounting plate, a clamping groove is formed in the top of the connecting block, a front fixing groove is formed in the left end of the clamping groove, a rear fixing groove is formed in the rear end of the clamping groove, a tail fin bottom plate is arranged at the upper end of the clamping groove, and the tail fin body is bonded to the top of the tail fin bottom plate. A clamping block is bonded to the front end of the tail fin bottom plate, a limiting block is arran