A quick installation multifunctional display comprising at least two display units and connecting pieces for connecting the display units together; said display unit comprising a frame formed by four side walls, and through-holes being formed in the side walls of the fame, said connecting pieces connecting the display units together by the through-holes in the side walls of the frame; said connecting piece _comprising a connecting seat and twist locks respectively connected to two ends of the connecting seat which are rotatable relative to end surfaces of the connecting seat, said connecting seat being sheathed in the through-holes of the side walls of the two adjacent frames, said twist locks leaning against inside surfaces of the side walls of the two frames to lock said display units; characterized in that: said connecting seat comprises: two connecting blocks (51a,51b) left-right opposite to each other; each of two connecting blocks (51a,51b) providing with a turning block (52a,52b) on its end and the ends of the two connecting blocks (51a,51b) being opposite to each other; a pressing block sleeving outer sides of the turning blocks (52a,52b); a locking block arranged just below two turning blocks (52a,52b); and a locking bolt; wherein said pressing block is in inverted-U shape, two turning blocks (52a,52b) are forward-backward symmetrically arranged and their two opposite sides are engaged with each other to be received in U-shaped notch of the pressing block; the top of said pressing block has a hole in the centre thereof, the opposite sides of two turning blocks (52a,52b) are respectively provided with big-end-up half holes, and said locking block has a screwed hole in the centre thereof, said locking bolt extends the holes of both the pressing block and the two turning blocks (52a,52b) to mesh with the screwed hole of the locking block. said connecting seat comprises: two connecting blocks (51a,51b) left-right opposite to each other; each of two connecting blocks (51a,51b) providing with a turning block (52a,52b) on its end and the ends of the two connecting blocks (51a,51b) being opposite to each other; a pressing block sleeving outer sides of the turning blocks (52a,52b); a locking block arranged just below two turning blocks (52a,52b); and a locking bolt; wherein said pressing block is in inverted-U shape, two turning blocks (52a,52b) are forward-backward symmetrically arranged and their two opposite sides are engaged with each other to be received in U-shaped notch of the pressing block; the top of said pressing block has a hole in the centre thereof, the opposite sides of two turning blocks (52a,52b) are respectively provided with big-end-up half holes, and said locking block has a screwed hole in the centre thereof, said locking bolt extends the holes of both the pressing block and the two turning blocks (52a,52b) to mesh with the screwed hole of the locking block. two connecting blocks (51a,51b) left-right opposite to each other; each of two connecting blocks (51a,51b) providing with a turning block (52a,52b) on its end and the ends of the two connecting blocks (51a,51b) being opposite to each other; a pressing block sleeving outer sides of the turning blocks (52a,52b); a locking block arranged just below two turning blocks (52a,52b); and a locking bolt; wherein said pressing block is in inverted-U shape,