The invention provides an in-wall hidden type socket. The in-wall hidden type socket includes a main plugboard, wherein a plurality of two-eye jacks and three-eye jacks are formed in the main plugboard; the upper side and the lower side of the main plugboard are each equipped with a mounting frame in a plugged manner; two sides of each mounting frame are each provided with a sliding device; two sides of the main plugboard are each provided with an auxiliary plugboard; the two auxiliary plugboards are arranged between the mounting frames in a sliding manner; a plurality of two-eye jacks, three-eye jacks and USB jacks are formed in the auxiliary plugboards; the two-eye jacks are connected in parallel mutually through wires; the three-eye jacks are connected in parallel mutually through the wires; and the USB jacks are connected in parallel mutually through the wires. For the socket in a hidden mode, the auxiliary plugboards are arranged at the back of the main plugboard in a hidden and sliding manner, so that the in-wall hidden type socket can be used only by pulling out the main plugboard from the wall as required and then dragging the auxiliary plugboards.