The invention discloses a snow blowing truck and a blowing nozzle thereof, wherein the blowing nozzle comprises a shell (10) and at least one clapboard (20); two ends of the shell are opened, the at least one clapboard is arranged in the shell to divide the internal space of the shell into at least two parallel flow channels, and each flow channel is respectively provided with an air inlet and an air outlet at the two ends of the shell; the flow channel corresponding to the air outlet at the bottom of the shell is a fast flow channel (30), and the blowing nozzle is designed to ensure that the time for the airflow to flow from the air inlet (31) to the air outlet (32) of the fast flow channel is shorter than that for the airflow to flow from the air inlets to the air outlets of other flow channels. The time for the airflow to flow from the air inlet to the air outlet of the fast flow channel is the shortest, so the airflow is blown from the fast flow channel to loosen the accumulated snow in a snow blowing process. After the accumulated snow is loosen, the snow is pushed away by the airflow blown from the air outlets of the other flow channels of the blowing nozzle. Therefore, in the use process, the power of the blowing nozzle does not need to be increased, thereby realizing high efficiency and energy saving.