Cast -in -place concrete floor indent steel tube frame comprises the H type support and the 2nd H type support that are parallel to each other, a H type support and the 2nd H type support all be formed by connecting first montant, second montant and horizontal pole, have the connecting rod to be connected between a H type support and the 2nd H type support, high equalling in cast -in -place concrete floor's the thickness of first montant and second montant, closely spaced in the diameter of indent steel pipe between first montant and the second montant. The utility model discloses a support frame is used for supporting the indent steel pipe, makes indent steel pipe levelness keep unanimous to guarantee that the indent degree of depth is unanimous.