The invention provides a novel process for removing ammonia, H2S and HCN in coke-oven gas in the coking industry, comprising: taking ammonia in coke-oven gas and the residual ammonia water as an alkali source to have reaction with H2S and HCN in the coke-oven gas, then carrying out the resolution in a regeneration tower, removing ammonia in the obtained mixed gas by a saturex firstly, and producing elemental sulfur by the residual sour gas in a Claus furnace. The process is characterized in that: a rich liquid is obtained by utilizing the strong ammonia water obtained by ammonia in the coal gas to have reaction with H2S and HCN in the coal gas under the vacuum state, the tower bottom takes the sensible heat of flue waste gas as a heat source, the resolution is implemented in the regeneration tower under the negative pressure, and the obtained barren solution on the tower bottom is used for rewashing the ammonia. The process has advantages of simple technique, low running cost, investment saving, and high ammonia, H2S and HCN removal efficiency, and is an innovation of ammonia, H2S and HCN removing process in coal gas for coke plants.