Tail fin for surfboard

The utility model provides a tail fin for a surfboard. The tail fin for the surfboard comprises a mounting plate; and the clamping rods are fixedly mounted at one ends of the two sides of the mounting plate correspondingly, and a fin body is fixedly mounted at the top of the mounting plate. According to the tail fin for the surfboard, through mutual cooperation of the connecting plate, the sliding groove, the clamping groove, a first magnetic plate, a rotating handle, a threaded rod, a groove, a limiting plate, a second magnetic plate, a clamping plate and other structures, when the tail fin is installed, a user does not need to clamp the clamping plate into the inner side face of a fixing base firstly, and then the clamping plate is clamped into the fixing base; after the clamping plate and the threaded rod are separated, the mounting plate and the connecting plate can be mounted, and the position of the connecting plate does not need to be repeatedly adjusted, so that the threaded rod is in threaded connect