The invention discloses an electric heating reinforcing device for children building blocks. The device comprises an electric heater body, wherein a through hole is formed in the center of the electric heater body, a clamping groove is formed in the front side of the through hole, and a first wiring port and a second wiring port are formed in the side face of the electric heater body. The heatable temperature of the electric heater body is not higher than 41 DEG C, and the shape of the clamping groove can be changed. Due to the fact that heating is achieved through the electric heater body and the heatable temperature of the electric heater body is not higher than 41 DEG C, building blocks can be effectively reinforced without scalding timber, and the situation that children are hurt by sharp corners of timber is avoided. Furthermore, due to the fact that the shape of the clamping groove can be changed, application range is widened greatly; the through hole is formed to prevent the situation that building blocks are hard to take out due to heating expansion.