Assembling type anti-freezing ecological side slope retaining wall for bleak, wet and cold climatic region and assembling method

The invention discloses an assembling type anti-freezing ecological side slope retaining wall for a bleak, wet and cold climatic region and an assembling method. The side slope retaining wall comprises a foundation pit slot formed in a pavement or a part, close to a side slope, of a side slope platform; a drain integration foundation is arranged in the foundation pit slot; a drainage ditch, a mortise and a drain pipe are arranged on the drain integration foundation; a first retaining wall building block and at least one second retaining wall building block are sequentially arranged on the sideslope from bottom to top; the bottom of the first retaining wall building block is assembled in the mortise; the bottoms of the second retaining wall building blocks are arranged at the top of the first retaining wall building block in a clamping manner; a drain layer is arranged among the first retaining wall building block, the second retaining wall building blocks and the side slope; cover plates are correspondingly f