Prefabricated channel cushion layer and lining structure capable of preventing frost heaving damage

The utility model relates to a channel prefabricated cushion layer and lining structure capable of preventing frost heaving damage, a channel prefabricated cushion layer (8) comprises an upper flexible waterproof layer (9), a middle drainage layer (10) and a lower thermal insulation material layer (11), and the upper flexible waterproof layer (9), the middle drainage layer (10) and the lower thermal insulation material layer (11) are prefabricated into an integrated structure, so that the laying of a channel lining is simpler, more convenient and more efficient. The canal lining structure comprises a sand gravel base layer (18), a canal prefabricated cushion layer (8) and a prefabricated concrete plate (1) which are laid from bottom to top, and water in the sand gravel base layer is collected through a drainage pipe, drained into a water collecting pipe (13) of a middle drainage layer and drained from the tail end of a canal. The precast concrete slab is connected with the upper flexible waterproof layer in a