The invention belongs to the field of a preparation process of oilfield chemicals and relates to an oilfield gel breaking technique, in particular to a liquid slowly-releasing acid gel breaker which aims at overcoming the problems that the operability is bad, the influence to the contracture effect is larger and the oil well can disable seriously in the prior art. In order to solve the problems of the prior art, the invention provides the technical schemes that the liquid slowly-releasing acid gel breaker contains ester acid-supply components and organic solvent protective solute components according to the mass ratio of 1 to 1-7, wherein the ester is a single component or the combination of a plurality of components of methyl formate, ethyl formate, diethy-aceto oxalate, dimethyl malonate and/or ethyl malonate; and the organic solvent is alkane or liquid ester. As the product of the invention can be released slowly, the construction operability and the effectiveness can be greatly improved; after the fracturing operation is finished, the product can be finally released completely, the viscosity of the gel breaking product is low, and the aims of completely breaking gel and flowing back in time can be achieved.