Modular box culvert mould

The utility model relates to a modular box culvert mould. The two ends of two side mould frames are respectively matched with end mould frames; a bed mould is positioned in a mould cavity formed by the two side mould frames and the two end mould frames, and is used for supporting the two end mould frames; an inner mould is positioned in a mould cavity formed by the two side mould frames, the two end mould frames and the bed mould; each side mould frame is formed by a mould frame and a mould frame base; the lower end of an inner mould frame of the mould frame is hinged with the mould frame base through a hinge lug; the lower end of the outer mould frame of the mould frame and the module frame base are hinged through a telescopic connection rod; the end mould frames which have different dimensions are respectively formed by four angle modules and one or more than one rectangular module in a splicing way; the inner mould is formed by two upper rotating angle modules, one or more than one transversal module and t