A display prop splicing device, comprising display bodies, luminous bodies, and connecting bodies, wherein the luminous bodies are erected on and electrically connected with the display bodies; the connecting bodies are used for fast electrical connection between the adjacent display bodies; a first mounting site and a second mounting site are respectively formed at two ends of each said connecting body; a third mounting site and a fourth mounting site are respectively formed at two ends of each said display body; the first mounting sites are cooperated with the third mounting sites, and the second mounting sites are cooperated with the fourth mounting sites; when two said display bodies are connected with each other, the third mounting site of one display body is cooperated with the fourth mounting site of the other display body; a first magnet and a second magnet which are attracted to each other are arranged in each said first mounting site and each said third mounting site, as well as in each said second mounting site and each said fourth mounting site; conductive poles (51, 52) used for the electrical connection between the adjacent display bodies are embedded into outer edges of each said first magnet and each said second magnet; and at least one said display body is electrically connected with an external electrical control device through a power line, wherein each said display body comprises a shell, a base, a positive wire, and a negative wire, wherein the positive wire and the negative wire are arranged in a length-wise direction of a cavity of the shell and have two ends respectively provided with the conductive poles (51, 52), wherein the luminous bodies are arranged on the shells and have positive poles electrically connected with the positive wires and negative poles electrically connected with the negative wires, wherein each said luminous body comprises a display shell, a circuit board, LED lamp beads, and a diffusion housing, wherein the circuit board is arranged in the display shell, the LED lamp beads are uniformly distributed on the circuit board, and the diffusion housing covers the display shell, characterised in that a first lug boss is arranged at one end of each said display body; the first magnets are embedded into intermediate parts of the first lug bosses; and the conductive poles (51, 52) are embedded into two opposite sides of each said first magnet, wherein a first recess part is arranged at one end of each said display body; the second magnets are embedded into intermediate parts of the first recess parts; and the conductive poles (51, 52) are embedded into two opposite sides of each said second magnet, and wherein the connecting bodies are arranged in a fan shape; a second lug boss and a second recess part are respectively arranged at two ends of each said connecting body; and the first magnets are arranged in the second lug bosses, and the second magnets are arranged in the second recess parts. wherein each said display body comprises a shell, a base, a positive wire, and a negative wire, wherein the positive wire and the negative wire are arranged in a length-wise direction of a cavity of the shell and have two ends respectively provided with the conductive poles (51, 52), wherein the luminous bodies are arranged on the shells and have positive poles electrically connected with the positive wires and negative poles electrically connected with the negative wires, wherein each said luminous body comprises a display shell, a circuit board, LED lamp beads, and a diffusion housing, wherein the circuit board is arranged in the display shell, the LED lamp beads are uniformly distributed on the circuit board, and the diffusion housing covers the display shell, characterised in that a first lug boss is arranged at one end of each said display body; the first magnets are embedded into intermediate parts of the first lug bosses; and the conductive poles (51, 52) are embedded into two opposite sides of each said first magnet, wherein a first recess part is arranged at one end of each said display body; the second magnets are embedded into intermediate parts of the first recess parts; and the conductive poles (51, 52) are embedded into two opposite sides of each said second magnet, and wherein the connecting bodies are arranged in a fan shape; a second lug boss and a second recess part are respectively arranged at two ends of each said connecting body; and the first magnets are arranged in the second lug bosses, and the second magnets are arranged in the second recess parts.