Spraying mechanism and hot air spreading device for resisting late frost

The invention discloses a spraying mechanism and a hot air spreading device for resisting late frost. The spraying mechanism comprises a mounting frame, a power assembly, a pushing assembly and a swinging assembly, wherein the power assembly is mounted on the mounting frame; the pushing assembly is connected with the power assembly and is arranged above the mounting frame; the swinging assembly isconnected with the power assembly and the pushing assembly; the swinging assembly is used for swinging in a reciprocating manner when the power assembly works and is matched with the pushing assemblyto spray airflow to crops in a swinging manner; a motor works to drive a worm to rotate; the worm drives a worm wheel and two half bevel gears to rotate at the same time; the worm wheel drives a rotating wheel and a rotating rod to rotate; the rotating rod drives a clamping column to do circular motion so as to drive a movable piece to drive a pushing rod and a sealing plug to do reciprocating motion; heated airflow is sp