The invention provides a clean and efficient gasification poly-generation process for a coal coke powder Y-shaped airflow bed, which comprises the following steps of: spraying coal water slurry or pulverized coal and a gasification agent and steam from an oxygen gas station into a gasification chamber for combustion and gasification through a top nozzle and a radially inclined side nozzle of a Y-shaped gasification furnace after ash content regulation and control; wherein the top nozzle and the side nozzle generate a plurality of jets which collide with each other at the center of the hearth to form a Y-shaped rotary impact area and a high-temperature reactor area, the residual ash is thrown to the furnace wall of the gasification chamber, the residual ash goes downward in a rotational flow, and the retention time of the ash is prolonged by more than 10 times; raw synthesis gas and slag flow into a chilling chamber, water mist rotational flow carries out mixing heat exchange, liquid slag is solidified by a dry method, and the temperature of the raw synthesis gas is controlled to be 500-950 DEG C; a high-temperature slag-fixing fluidized bed heat collector recovers heat again underthe action of fluidized steam, and the raw synthesis gas is discharged as a novel cementing material by using a two-stage lock bucket intermittent dry method; the ash-containing raw synthesis gas passes through a gas-ash separator, the ash with higher residual carbon content is returned to a coal dust bin for recycling, and purified synthesis gas enters a next pretreatment process after heat exchange and decarburization and water washing.