120h ultra-slow setting waste-based sprayed concrete and preparation process thereof

The invention discloses 120-hour super-slow setting waste-based sprayed concrete and a preparation process thereof, and the 120-hour super-slow setting waste-based sprayed concrete is prepared from the following raw materials by taking cement as a standard: 100% of cement, 400% of earth and stone waste, 15%-30% of fly ash, 42-49% of mixing water, 2%-4% of a compound retarder, 5%-8% of an accelerator, 0.015%-0.025% of an air entraining agent, 1.5%-2.5% of an early strength agent and 0.075%-0.125% of a defoaming agent. The compound retarder is prepared by compounding a polycarboxylic acid water-reducing mother solution, a polycarboxylic acid slump retaining mother solution, sodium tripolyphosphate, sodium gluconate and water according to a certain proportion, and the compound retarder simultaneously contains inorganic matters and organic matters, so that the hydration of cement is jointly prevented, and the effect is remarkable. The premixed wet material has enough delayed coagulation time, and the sprayed conc