The invention relates to a method for thinning a metal solidification texture, which belongs to the technical field of material processing. A pulse magneto liquid level vibration method achieves a better thinning effect by acting a multi-layer coil on a liquid metal level. The method comprises the following steps of: arranging a non-contact multi-layer oil at a position 0.1 to 20cm above the liquid metal level; and performing pulse magneto liquid level vibration treatment, wherein treatment parameters comprise a pulse current I of 10 to 10,000A, a pulse width of 10mus to 50ms and an acting frequency f of 0.01 to 2 kHz. In the invention, the multi-layer is acted on the upper surface of a metal melt, practical operation is very simple and convenient, and the solidification texture of a castingot has an obvious thinning effect. When the method is applied to industry, the action mode can realize non-contact melt processing, and the coil can be conveniently moved to perform bath processing to improve production efficiency; and, shielding effects of a cast molding machine or a crystallizer on a magnetic field can be avoided. The method is suitable for die casting, semi-continuous casting and continuous casting production in the metallurgic industry and suitable for thinning the texture of various metal materials.