The invention provides a machine-made sand regulator of an alcohol ether modified carboxylic acid polymer and a preparation method of the machine-made sand regulator. The preparation method comprises the following steps: firstly, adding 75-91 parts of carboxylic acid monomer acid, 33-67 parts of alcohol ether monomer, 2-4 parts of chain transfer agent, 0.1-0.3 part of polymerization inhibitor and water into a reaction kettle provided with a stirrer; conducting heating to 80-90 DEG C by adopting a water bath; then using 150-175 parts of carboxylic acid monomers, 0.1-0.3 part of a polymerization inhibitor and 178-187 parts of water to prepare a solution A, using 1.64-3.21 parts of an initiator, 2-8 parts of a chain transfer agent and water to prepare a solution B, and dropwise adding the solution A and the solution B into the reaction kettle through a dropwise adding pump, wherein the solution A is dropwise added for 1-1.5 hours, and the solution B is dropwise added for 1-2 hours; and after dropwise adding the solution A and the solution B, preserving heat for 1-2 hours, conducting cooling, conducting discharging, and replenishing water to 1000 parts, thereby obtaining the machine-made sand regulator. By introducing the alcohol ether monomer, the side chain length and flexibility of a polymer molecular chain are increased, the dispersing performance of the polymer is improved, the polymer can adapt to machine-made sand of different grades, and the use performance of the machine-made sand is improved.