The utility model belongs to the technical field of the building goods, concretely relates to just, tear formula PC wallboard mould open with opening in a wall module. This mould includes four internal lobe wall side formss and spacer: the die cavity face fovea superior of internal lobe wall side forms is equipped with U type constant head tank, the concave positioning arc groove of establishing of long avris department of spacer, the spacer is pegged graft and is fixed in in the U type constant head tank, this mould still includes the opening in a wall module, and the opening in a wall mouldsplits is four group's angle terminal mould and two sets of straight flange submodules, in the projection of vertical direction, the vertical cuts a most advanced indication direction of parallel oneof them the angle terminal mould that cuts of the projection line that forms, cross section appearance " L " the word form of internal lobe wall side forms. This mould possesses the advantage that simple, the simple and efficient to handle and cost of manufacture of form removal is low, can guarantee once building the fashioned while of opening in a wall, realize steel bones RACK the prefabrication, wholly go into mould and fast form removal operation, the preparation efficiency of prefabricated wall body can greatly be promoted.