An assembly play equipment for children has bases comprising of a pair of end plates which are made vertical in shape and face each other, are formed at top parts of facing surfaces with open windows, are connected at center parts by a seat surface member, are connected at bottom parts by reinforcing members, and are provided at the center parts with pluralities of first connecting holes for connection use which form rotation preventing parts, and one or plural such bases have a step climbing stand, slide, twisted slope, climbing slope, arcade bridge, arch balustrade net bridge, corridor bridge, bulging bridge, wave bridge, or ring tunnel suitably selected and assembled together with the one or plural such bases by connecting the second connecting holes and the first connecting holes with connecting pieces.