Clothes drying main machine with drainage structure and clothes dryer

The clothes drying main machine with the drainage structure comprises a base, a main machine shell, an air duct, a draught fan, a PTC heating assembly, an air outlet base and an air outlet cover, a drainage cavity with an upper opening is formed in the center of the base, and a drainage hole is formed in a bottom plate of the drainage cavity; the air duct comprises a transverse device cavity, a longitudinal air outlet cavity and a water collecting groove formed in a bottom plate of the longitudinal air outlet cavity, and the fan and the PTC heating assembly are arranged in the transverse device cavity; the main machine shell and the base are buckled and fixed to form a machine shell, the air outlet base is arranged at the top of the main machine shell, the air outlet cover is buckled with the air outlet base, the air channel is formed in the machine shell, the opening end of the transverse device cavity is opposite to the air inlet hole set in the main machine shell, and the upper end of the longitudinal air